# Jp Jazz Adlib

> Line-drawing jazz improvisation - draw the melodic contour line first, then fill in notes. Covers the line-type system, chord-tone priority beat positions, gake (large leaps), approach notes, chromatic scale, scale selection, kishotenketsu solo construction, and hands-on Blues and Rhythm Changes. Use when the user wants to write jazz solos/improvised phrases, when phrases don't sound jazzy enough, or when building lines over II-V-I.

- Skill: `jtydhr88/jp-jazz-adlib` (Agent Skill)
- Install (CLI): `npx skillmds@latest add jtydhr88/jp-jazz-adlib`
- Raw SKILL.md: https://api.skillmd.com/api/skills/jtydhr88/jp-jazz-adlib/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: jtydhr88 (https://skillmd.com/u/jtydhr88)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/jtydhr88/jp-jazz-adlib

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# Line-Drawing Jazz Ad-lib (線から描くジャズ・アドリブ)

Methodology source: Kado Takuhiro, *Sen kara Egaku Jazz Ad-lib no Tsukurikata* ("How to Build Jazz Ad-libs by Drawing Lines", Rittor Music, 2016).

Core idea: **do not start from scales — start from the "line" (線, the melodic contour drawn before choosing notes)**.
The root cause of "memorized every scale but still can't improvise" is not knowing how to *use* the memorized scales.
The solution: take your humming (hana-uta) or the vague mental image of "roughly higher here, roughly lower there" (nantonaku) and draw it directly as a contour line (線) on the staff, then translate the line into notes — no perfect pitch required.

## 0. Overall Workflow (Three Steps)

1. **Draw the line**: draw the melodic direction directly as a polyline on the staff (ascending / descending / mountain / valley / zigzag). The line = the phrase's contour and guide.
2. **Fill in notes**: write notes along the line (eighth notes as the basic unit), filling it with three kinds of material: "scale + arpeggio + chromatic scale".
3. **Adjust to the chords**: following the "chord-tone priority beat-position ranking" (Chapter 3), change the notes on key beat positions to chord tones (chord tones / コード・トーン) of the current chord.

Conventions and terminology:
- Default environment in the book: C major, 4/4 time, demo progression **Dm7→G7→C△7** (IIm7–V7–I△7).
- Note names use Japanese katakana fixed-do solfège: ド=C, レ=D, ミ=E, ファ=F, ソ=G, ラ=A, シ=B.
- **オモテ拍 = on-beat** (the first eighth-note half of each beat); **ウラ拍 = offbeat** (the second eighth-note half).
- **Strong/weak pattern**: beats follow "odd strong, even weak" (beats 1 and 3 = strong beats), and measures likewise ("odd strong, even weak": measures 1 and 3 = strong measures).

## 1. Four Hard Conditions for Drawing Lines

1. **Stay within the instrument's range**:
   - Keep the phrase's total range within **2 octaves**;
   - Center on the middle register (the middle register plays best on any instrument; extreme high/low registers require advanced technique).
2. **Do not stretch intervals (インターバル) too wide**:
   - **Within 2 beats (4 eighth notes), stay within 1 octave**;
   - When you want a wide range, draw a long line — not a steep short one.
3. **Do not draw lines that are too complex**: overly complex lines are unplayable; keep them simple.
4. **Do not exceed your own technique**: the primary goal is to play the phrase from start to finish without mistakes — avoid virtuoso high-speed passages, huge leaps, and complex rhythms.

## 2. The Line-Type System (線の種類と組み合わせ)

Basic unit: **2 beats, 4 notes (eighth notes)**. For lines in the same direction, **the angle determines the character**:
- Gentle angle → scale-style (スケール) melody;
- Steep angle → wider intervals → arpeggio-style (アルペジオ) phrase.

### 2.1 Ascending Lines (上昇)

- **Gentle ascent (なだらかな上昇)**: first-to-last interval of a **4th–5th**.
  - Examples (starting from ド): ドレミファ, ドレミソ, ドミファソ.
- **Steep ascent (急上昇)**: first-to-last **6th–7th** (4 notes exceeding one octave sounds off, so staying within the octave is the rule).
- Steep ascents are graded into 3 levels by the **largest internal leap** within the phrase:
  - Contains a **3rd** leap: ドミファラ, ドミソラ, ドミソシ — no awkwardness at all, blends most easily into a melody;
  - Contains a **4th** leap: ドファソラ, ドレソラ, ドレミラ, ドファソシ, etc. — intermediate character;
  - Contains a **5th** leap: ドソラシ, ドレミシ — strong impact, but harder to blend into a melody.
- Choose by taste, but remember the character difference between the three levels.

### 2.2 Descending Lines (下降)

- The mirror image of ascending: same 2-beat/4-note unit, divided into gentle/steep.
- Gentle descent (first-to-last 4th–5th): ドシラソ, ドシラファ, ドシソファ, ドラソファ.
- Steep descent (first-to-last 6th–7th), likewise graded by largest internal leap:
  - Contains a 3rd: ドシソミ, ドラソミ, ドラファレ, etc. — natural;
  - Contains a 4th: ドソファミ, ドシラミ, ドラソレ, etc.;
  - Contains a 5th: ドファミレ, ドシミレ — strong impact, hard to blend.

### 2.3 Flat Lines (平坦)

- Definition: an extremely gentle rise/fall whose first-to-last interval within 2 beats stays **within a 3rd** (not repeated same notes).
- In a major scale, 4 eighth notes won't fit inside a 3rd → the core technique is **changing the rhythm**:
  - First-to-last 3rd: mix in one **quarter note** (ド-レミ, ドレ-ミ, ド-シラ, ドシ-ラ) — a quarter note dropped into a stream of eighths creates rhythmic impact (インパクト) by itself;
  - First-to-last 2nd: only 2 notes are possible (quarter or dotted-quarter rhythms, e.g. ド→レ, ド→シ) — suits a relaxed (ゆったり) mood;
  - First-to-last unison (same pitch): one sustained note — precisely because there is only one note, it stands out strongly in the phrase and carries an important role.
- **The chromatic scale (半音階) lets you achieve a flat line while keeping 4 eighth notes**:
  - Examples: ド ド♯ レ レ♯, ド ド♯ レ ミ, ド シ シ♭ ラ, ド(quarter) シ シ♭.
  - **Key rule: put altered notes (notes with accidentals) on the offbeat (ウラ拍) as much as possible**; landing on the on-beat makes them sound outside the key (Key).
  - E.g. in ドシシ♭ラ, シ♭ landing on the on-beat is a shape to avoid; the quarter-note version ド-シ-シ♭ is preferable.

### 2.4 Zigzag Lines (ジグザグ)

- Motivation: when you want to keep continuous eighth notes without using the chromatic scale or reducing the note count, notes are allowed to **"derail" (脱線, deviate from the line)**, forming a small repeated up-down zigzag.
- Two derailing rules:
  1. Do not deviate far from the original line;
  2. **The first note and last note must not change** (start and end fixed; the middle is free).
- Notated examples (2 beats, 4 notes):
  - First-to-last 2nd: ドミドレ, ドレミレ (ascending); ドシラシ, ドラドシ (descending);
  - First-to-last 3rd (more options): ドレドミ, ドミレミ, ドミファミ, ドレファミ (ascending); ドシドラ, ドラシラ, ドラソラ, ドシソラ (descending).
- For players who "can only run up and down the scale", "draw a flat line + fix the eighth-note count" is an extremely effective option.

### 2.5 Short Lines and Long Lines

- With the same start and end points:
  - Short line → steep angle → arpeggio-like (e.g. ラ ド ミ ファ ソ charging up in two beats);
  - Long line → gentle angle → near-flat, to be filled with "scale + chromatic + derailed notes" (e.g. ラ シ ド シ ド ド♯ レ レ♯｜ミ ド レ ミ ソ…ラ).
- Good short-line example: 4 notes within 1 octave (ラ ド ミ ソ);
- Bad short-line example: 4 notes exceeding 1 octave (ド ソ ミ ド spanning past the octave) — **when you want a wide range, draw a long line, not a steep short one**.
- **Long lines are the key to escaping beginner level**:
  - Common trait of beginners = phrases are too short; they can barely play 2+ continuous measures of eighth notes, and even when they can, it is mostly scale runs up and down;
  - Practice: first draw ascending/descending lines of 2+ measures, **decide the line's length and angle (starting note, ending note) in advance**, and practice until you can play right along the line.

### 2.6 Mountain (山: ascend → descend)

- Three elements: **start point, peak (頂点), end point**, each assigned to low/mid/high register; shifting the peak's position forward or backward produces all kinds of mountains.
- Note-filling rules:
  - Start → peak with a **wide register span** (low → high) → run the major scale;
  - **Narrow span** (low → mid, mid → high) → fill mostly with the chromatic scale.
- The peak's position determines the character:
  - **Peak in the middle** (1 measure up + 1 measure down): the orthodox mountain shape. **Caution: in a near-symmetrical mountain, deliberately change the note choices between ascent and descent**, otherwise it becomes a boring mirror image.
    - Example: ascending scale ミファソラシドレミ, descent replaced with leap-containing ファミレド ラファミレ;
  - **Peak in the front half** (beats 2–3 of measure 1): start → peak is a steep ascent → naturally forms an **opening ascending arpeggio**; peak → end is a long gentle descent → often uses chromatics or quarter-note rhythmic variation.
    - **"Ascending arpeggio + chromatic descent" is a high-frequency classic pattern of jazz phrasing — master it without fail**;
    - Example: ファラドミソ ソ♭ファミ｜レドシラソファミレ (F-A-C-E-G arpeggio charges to the peak, then a long chromatic+scale descent);
  - **Peak in the back half**: peak → end is a steep descent → **descending arpeggios (下降アルペジオ)** appear frequently.
    - Most players are fluent in ascending arpeggios but weak at descending ones — use this as the chance to overcome it.

### 2.7 Valley (谷: descend → ascend)

- The inversion of the mountain: design with three points — **start point, bottom (底点), end point** — likewise classified by low/mid/high register when drawing.
- Same caution: in a near-symmetrical valley, do not let the descent and ascent be left-right symmetrical in their notes.
- **Bottom in the front half**: often opens with a **descending arpeggio** (e.g. ファレシソ… dropping to the bottom), then bottom → end is a gentle long ascent;
- **Bottom in the back half**: start → bottom descends gently, bottom → end **rises steeply**.
  - Example: ソ ファ ミ ミ♭ レ ド シ ラ｜ソ ファ ミ レ ド ファ ラ ド (a gentle descent lasting nearly two measures, then the closing ファ–ラ–ド arpeggio-style leaps pull back up to the high register).
- Filling pattern: **descending segments favor dense chromatic filling (all chromatic notes on offbeats); the ascending sprint favors scale + arpeggio leaps to create steepness**.

### 2.8 Combining Mountains and Valleys (組み合わせ)

- Real phrases are combinations of mountains and valleys. Method: **first decide how many times the line bends and fix the overall shape**, then convert to notes.
- **2-bend variation** (2 bends = 3 line segments):
  - Only two basic forms: ascend→descend→ascend, and descend→ascend→descend;
  - Combine segments by length as **short/long/equal** (within 2 measures use "2 short + 1 long" or "3 equal"; "2 long + 1 short" won't fit).
- **3-bend variation** (3 bends = 4 segments): up→down→up→down or down→up→down→up, segments roughly equal.
  - **Important: multiple peaks (or bottoms) must not sit at the same height** — equal heights sound like a plain scale run up and down, and not cool;
  - **Scatter** the peak and bottom heights (e.g. first peak レ, second peak ファ higher).
- **Applied form of the 2-bend variation**: two segments in the same direction (ascend→ascend, descend→descend) = **changing the line's angle midway**.
  - E.g. "gentle chromatic ascent → steep arpeggio ascent": the density suddenly shifts — still continuously ascending, yet the impression is completely different.

### 2.9 Dynamics (強弱)

- The universal tendency of melody: **high notes strong, low notes weak**. Jazz phrases are no different.
- **Mountain shapes are strongest at the peak (add an accent / アクセント); valley shapes are weakest at the bottom.**
- The biggest reason that transcribing (コピー) a master and "playing the same notes still doesn't sound like them" = failing to reproduce the dynamics.
- Once the fingering is secure, always play with dynamics in mind.

## 3. Note-Filling Rules: Adjusting the Line into Notes (音へ変換するときの調整法)

### 3.1 Chord-Tone Priority Beat-Position Ranking (優先順位) ★ Core Rule

Chord tones alone cannot make a fluent phrase (strictly speaking they can, but it isn't cool), so **set a priority ranking and align chord tones only on selected beat positions** (the smaller the number, the higher the priority — placing a chord tone there is the more "stable" choice):

| Rank | Position |
|---|---|
| **①** | **On-beat (オモテ拍) of beat 1 in odd-numbered measures** |
| **②** | On-beat of beat 1 in even-numbered measures |
| **③** | On-beat of beat 3 in every measure |
| **④** | On-beats of the even beats (beats 2 and 4) |
| **⑤** | Offbeats (ウラ拍, all of them) |

- In practice, **covering levels ②–③ is enough** (= the on-beats of beats 1 and 3 of every measure are chord tones).
- **Do not over-apply**: extending to ④⑤ makes the phrase almost entirely stepwise diatonic motion and turns it "ordinary" — "ordinary" is not bad, but staying that way from start to finish cannot please the listener.
- **The priority ranking can vary phrase by phrase**: one phrase uses up to ③, the next only ①, alternating tension and release.
- With a chord progression (e.g. Dm7→G7→C△7, one chord per measure): the on-beats of beats 1 and 3 of each measure = chord tones of the **current chord**.
  - Dm7 = レ ファ ラ ド; G7 = ソ シ レ ファ; C△7 = ド ミ ソ シ.
- When the line conflicts with a chord tone, correction is inevitable (e.g. the line sits near ファ but a chord tone is required → deliberately move the note to ソ) — be able to respond flexibly.
- Probability safety net:
  - Of the 7 scale tones, a four-note chord's chord tones account for 4 → even landing at random you hit a chord tone with **4/7 (better than half) probability**;
  - When the line misses a chord tone, **moving a second up or down is guaranteed to hit one** (chord tones and non-chord tones alternate within the scale), so no big rewrite is needed.

### 3.2 Sustained Notes (伸ばす音を入れる)

Using nothing but eighth notes falls into monotony (マンネリ). Add **notes sustained 2 beats or more**, deciding two things: **position (beginning / middle / end) × pitch (high / low)**:

| Position | High sustained note | Low sustained note |
|---|---|---|
| **Beginning** | Creates impact (インパクト); suits moments when the energy is already high, or the opening of a short solo | Quiet opening; common when a long solo warms up gradually (combined with reducing the note count) |
| **Middle** | Very effective "just before charging to the peak", followed by a climactic phrase | Gives a sense of the phrase "pausing" — good for scene changes |
| **End** | Ending on a long high note amid the climax = the classic (定番) way to keep the heat to the very end | Calmly settles the solo; use over a one-chord (1コード) solo or when unsure how to end |

### 3.3 Designing the Point Note (ポイント)

- Jazz is generally played **with accents on the high notes**, i.e. the mountain peak; this "spot that stands out in performance" is called the **point (ポイント)**.
- **Peak = the strongest, most impactful note → the peak note must be a chord tone** (over C△7, among candidates ファ/ソ/ラ, choose the chord tone ソ).
- Peak at the phrase start (open high, move down) vs. peak at the end (open low, climb up) give completely different impressions:
  - Choose by taste, but **in an actual solo do not lean to one side** (all high openings, or all high endings = bad examples).
- **Sustaining the peak** (2+ beats) → the highest note is emphasized even more → all the more reason it should be a chord tone; the beginning/middle/end positions each give a completely different impression — use them in balance.
- Reverse technique: accent the **lowest note**:
  - The exact opposite of the usual accenting habit — use it when you want to create impact;
  - The lowest note will stick out unusually — **to avoid sounding out of key, the lowest note must also be a chord tone**.
- **Low sustained notes almost never take an accent**:
  - The nature of a long low note is not "attract attention" but "lurk quietly" (laying groundwork for the later build-up / 盛り上げ);
  - But when the sustained note occupies most of the measure's duration → it should still be a chord tone.

### 3.4 Three Ways to Start a Phrase (ポイントを最初へ)

The same line sounds completely different depending on how it starts:
1. **Start moving (動かして始める)**: begin the phrase in motion with eighth notes — the default approach;
2. **Start with a sustained note (伸ばして始める)**: hold the first note for a quarter note or longer before dropping into the eighth-note flow;
   - Benefit: **you can think about the rest of the phrase while sustaining the first note**, which reduces pointless dragging at the phrase's end;
3. **Start with a rest (休符で始める)**: deliberately **do not play** the beginning portion of the line — open the phrase with a rest;
   - Benefit: the way space between phrases is taken (間の取り方) changes, giving the listener a sense of ease.
- Common beginner ailment: starting "in motion" with dense notes, running out of material (ネタ切れ) toward the back half, and always dragging a long note at the end — dense front, sparse back.
- Direction for improvement: **move the note-count reduction from the phrase's tail to its head**.

### 3.5 Ending the Phrase (フレーズの終わり方)

- Starting matters, and the ending equally shapes the impression; stock several ending patterns to prevent monotony (マンネリ化).
- Method: **decide the note count of the final measure in advance** — exactly 1 note / 2 notes / 3 notes / 4+ notes; practice each category to correct inertia and ingrained habits (クセ).
  - 1 note: the final measure holds only a whole note (e.g. ド over C△7);
  - 2 notes: ド→ミ, ド→ソ, etc., with 4 rhythmic variants (including the form that syncopates in from the previous measure's offbeat);
  - 3 notes: various rhythmic placements of ド レ ミ;
  - 4+ notes: chromatic climbs like ド ド♯ レ ミ / ド ド♯ レ レ♯ ミ ソ…, denser as the notes increase.
- Common point: however many notes, **the final landing note is a chord tone** (over C△7, land on ミ, ソ, ド), and chromatic notes along the way (ド♯, レ♯) fall on offbeats.
- **Idea ① syncopation (シンコペーション)**:
  - Here this means **a rhythm that enters early from the offbeat (ウラ拍) with a tie (タイ)**;
  - **When reducing the note count, introduce syncopation** — if every note lands on the on-beat, it sounds stiff.
- **Idea ② length of the final note**:
  - The default is to let the final note extend along the line to the last beat;
  - Also keep the option of "**deliberately adding a rest to cut the line short midway**" (final note stops abruptly as an eighth) — merely shortening the last note changes the impression completely;
  - Likewise: do not use the same rhythm every time.
- Few notes → technically easy but hard to sound cool; many notes → easy to sound cool but prone to monotony. Build a large ending stock in both directions.

### 3.6 Varying the Note Count and Shrinking the Line (音数を変える・線を縮める)

- Fundamental order: **first realize the entire line in eighth notes (2 measures = 16 notes), then subtract**.
- **Subtracting notes demands better rhythmic control** (after adding long notes it is easy to rush / ハシる; practice until you can carve out the rhythm accurately).
- Reduction method A: replace some 2-beat group of "4 notes" with a long-note rhythm such as "dotted quarter + eighth" (position is free; there is more than one rhythmic pattern — try several).
- Reduction method B (**線を縮める, shrinking the line**): keep the **pitches** of the start / peak (or bottom) / end unchanged, and shorten the line by **sliding the start or end horizontally**:
  - **Push the start later**: open with a rest (e.g. rest + ソシドミソ｜…);
  - **Pull the end earlier**: close early (e.g. …ラソミド ソ + rest).
- **NG rule: rests may not be placed in the middle of a phrase** — only at the head or tail.
  - Inserting one in the middle changes the "number of lines" (本数), destroying the solo image you originally designed.

### 3.7 Correcting the Line (線の修正)

Once drawn and converted to notes, the result may still not sound good; when "something feels off", three corrections (all keeping start, peak/bottom, and end unchanged):
1. **Just try bending the line (とりあえず線を曲げてみる)**:
   - The most common boring phrase = a plain scale ascent + descent (ドレミファソラシド｜レドシラソファミレ) — this does not count as a jazz phrase;
   - Turn it into a two-stage shape: **steep arpeggio ascent + gentle chromatic ascent** (ド ミ ソ ソ♯ ラ シ ド ド♯｜…, with ド♯ as a leading tone toward レ);
   - Same for descents: insert chromatics (レ シ ラ ラ♭ ソ ファ ミ レ) to create a two-stage descent;
   - Arpeggios and the chromatic scale are precisely the key (キモ) to jazz-flavored phrases.
2. **Insert an arpeggio (アルペジオを入れる)**: swap some 2-beat group for an arpeggio;
   - Opening: ド ミ ソ シ ド charging straight to the peak; closing: レ♭ ド ラ ファ レ descending arpeggio to settle.
3. **Insert the chromatic scale (半音階を入れる)**: swap some 2-beat group for chromatics;
   - Opening: ド ド♯ レ レ♯ ミ…; descending: レ レ♭ ド シ.
- Column viewpoint, "予測できるのはつまらない" (what can be predicted is boring):
  - Nothing but scale runs up and down = a performance the audience can fully predict; the player must exceed the listener's predictions;
  - Goal: **mix at least two of the three materials — "scale, arpeggio, chromatic" — within a single phrase**.

## 4. The Three Jazz-ifying Weapons (Gake / Approach Notes / Chromatic Scale)

### 4.1 Gake (崖, "cliff" — a leap of a 4th up to an octave)

- Definition: a leap interval within a phrase of **a 4th or more, up to 1 octave**, appearing as a **vertical line** when drawing.
- Divided into the **ascending type** (leap up) and **descending type** (leap down); both are common.
- **Gake of a 6th or 7th most easily create phrases with a memorable point** — used well, they raise your improvising a whole level at once.
- **The first note after the leap usually carries an accent (アクセント)** — it is the most impactful note in the phrase; when a gake jumps up to a high note it is accented nearly 100% of the time, and you must be able to deliver it solidly on both on-beats and offbeats.
- Three rules:
  1. **Gake limited to within 1 octave**: an interval that is too wide destroys the melody instead (NG); the general rule "no more than 1 octave within 2 beats" applies here too;
  2. **Between an ascending line and another ascending line, a descending gake is mandatory**:
     - If the gake also went up, the melody would rise without end and become an off-the-wall (突拍子もない) melody;
     - To stay melodic (メロディアス), the key is sandwiching a descending gake between the rising lines;
     - Example: ソ ソ♯ ラ ラ♯ シ ド レ ↘ファ｜ソ ラ ド レ ミ ファ ソ ラ;
  3. **Between a descending line and another descending line, an ascending gake is mandatory** (the symmetric rule — otherwise it falls forever);
     - Example: ラ ラ♭ ソ ファ ミ レ ↗シ シ♭｜ラ ファ レ ド シ ラ ソ ミ.
- **Beat position of the gake (崖の位置)**:
  - First, notice whether the leap happens on the on-beat (オモテ拍) or the offbeat (ウラ拍) — neither is right or wrong, but:
  - **In jazz from the bebop era onward, gake frequently occur on the offbeat (ウラ拍)** — rare in other styles, arguably a melodic trait unique to jazz; consciously build gake on offbeats;
  - The **"offbeat gake" (ウラ拍の崖)** is a **wall that must be conquered** to leave the beginner stage (beginners only leap on on-beats and are universally afraid of offbeat leaps);
  - The most common position = **the offbeat of the odd beats (beats 1 and 3)** — the "classic of classics" (定番中の定番), master it without fail;
  - **The on-beats of the even beats (beats 2 and 4)** = a rarely used position — precisely because of that, building a gake there easily yields a **unique (ユニーク)** phrase; try it after mastering the odd-beat offbeats;
  - Drill: take the same line and shift only the leap point's beat position (all 16 on/off positions of beats 1–4 across 2 measures, one gake at a time), comparing the sound — the core exercise for internalizing beat-position feel.
- **Multiple gake (複数の崖)**: a phrase is not limited to one gake. Decide two things first:
  1. **Distance between gake** (beats apart): three tiers — **≤2 beats / 2–5 beats / ≥5 beats**;
  2. **Beat-position combination of the gake**: オモテ→ウラ, ウラ→オモテ, ウラ→ウラ, オモテ→オモテ.
  - Offbeat leaps = jazz flavor; **mixing an on-beat gake and an offbeat gake within the same phrase is even cooler** (using them distinctly is difficult, but extremely important for mastering gake);
  - Three or more gake are allowed, but **if phrases containing 3+ gake recur throughout a solo, it stops sounding melodic** — even once skilled, do not overuse.

### 4.2 Approach Notes (アプローチ・ノート)

- Conceptual origin: the major scale's 7th degree, the **leading tone** (導音; シ in C major), strongly tends to resolve to the **tonic** ド.
- An approach note = transplanting the leading tone's nature onto any note: first set a **target note (ターゲット・ノート)**, then lead into it **immediately before** with **the note a half step below**.
- Mindset shift:
  - Most people build phrases "from the front"; **jazz phrases are often built by fixing the target note first and working backward** (composing back-to-front actually flows better);
  - The line method's start/peak/end points themselves already imply "clarify the target note first".
- Position rules:
  - The approach note goes **on the half-beat immediately before** the target note;
  - Since accidentals must sit on offbeats (the key-preservation principle), **the approach note falls on the offbeat (ウラ拍) and the target note necessarily lands on the on-beat (オモテ拍)**;
  - The target note is **best as a chord tone** (any in-scale note is acceptable).
- The 7 approach-note pairs in C major (idioms unique to jazz phrasing — master them thoroughly):
  - ド♯→レ;
  - レ♯→ミ;
  - **ミ→ファ** (natural half step);
  - ファ♯→ソ;
  - ソ♯→ラ;
  - ラ♯→シ;
  - **シ→ド** (natural half step).
- **Rules for the note before the approach note**:
  1. Use **a note higher than the target note**: the approach note then functions as a leading tone; the distance between that note and the approach note must be **within 1 octave** (an octave or more apart = NG);
  2. If using a note lower than the target, **the only option is the note a half step below the approach note** (entering via consecutive chromatic ascent) — any lower note makes it sound like the scale has changed;
  3. **Same pitch as the target = NG**: the approach note's leading-tone quality is lost.
- The two most effective placements:
  - **The bottom of a valley (谷型の底点)**: a near-symmetric valley bottom easily repeats the same note (…ファ ミ｜ファ…); replacing the bottom with an approach note avoids it (…ファ レ♯｜ミ ファ ソ…, レ♯ → target ミ);
  - **The landing note of a descending gake**: change the landed-on note into an approach note → very jazzy (…ソ ↘ラ♯｜シ ド レ…, drop to ラ♯ then immediately resolve chromatically to target シ).
- Overuse warning and integration rules:
  - Approach notes can in principle go anywhere as long as they're on offbeats, but **repeated overuse destroys the sense of key**;
  - **On-beats: use in-scale notes**;
  - Going further: **at measure boundaries (beat 1 on-beat), use chord tones** → expresses key feel + chord feel at once.

### 4.3 The Chromatic Scale (半音階)

- **Jazz improvisation almost inevitably contains the chromatic scale somewhere; mixing chromatics into a phrase is one of the secrets to producing "jazz flavor" (ジャズっぽさ)**.
- It also solves the "repeated notes" problem:
  - Jazz phrasing is characterized by rich harmonic color from tensions (テンション) etc.; many repeated notes within a measure (e.g. ドレミレドシ) destroy that;
  - **Actively using the chromatic scale avoids note repetition within the measure**.
- Iron rule: **altered notes on the offbeat** (not an absolute rule, but it prevents sounding "out of key"; keep it in mind at all times).
- The trap — on/off-beat distribution when playing the chromatic scale in continuous eighths (starting from ド):

| On-beat (オモテ拍) | Offbeat (ウラ拍) |
|---|---|
| ド | ド♯ |
| レ | レ♯ |
| ミ | **ファ** |
| **ファ♯** | ソ |
| ソ♯ | ラ |
| ラ♯ | シ |

- Because **ミ–ファ is itself a natural half step** (no sharp), from ファ♯ onward the altered notes flip onto the **on-beats**. Countermeasures:
  - At ミ, **change the eighth note to a quarter note** (resetting the on/off relationship); or
  - **Skip ファ♯ entirely**, so subsequent altered notes return to the offbeats.
- Most players memorize the chromatic scale by **finger habit (指グセ)** rather than note names → altered notes drift onto on-beats unnoticed — check with note-name awareness.

## 5. Rhythm and Rests (リズムと休符)

### 5.1 Basic Rhythm Principles

- **Eighth notes are the body of improvisation**: first aim to play 2+ measures accurately in eighth notes — the first wall out of beginner territory.
- **Reduce syncopation**:
  - Big-band ensembles and theme melodies use lots of syncopation, but **restrain syncopation when improvising**; take "1 measure = 8 eighth notes" as the basis;
  - Exception: Latin-style tunes actually pair well with heavy syncopation.
- **Swing (スウィング) ≠ haneru (ハネる, shuffle-style bouncing)**:
  - Haneru = splitting the eighth pair into a 2:1 triplet feel; in swing the on-beat eighth is only slightly lengthened, never that far;
  - Trick: don't sing phrases as "ta-a-ta ta-a-ta" — sing with voiced consonants, "**doo-di-doo-da (ドゥーディドゥーダ)**" — the voiced consonants delay the articulation slightly, and that "slight lateness" is the essence of swing.

### 5.2 Adding Notes by Tempo

Pure eighth notes at the mainstream session tempos of **120–140 (medium slow – medium)** sound stretched-out and slack (間延び), not cool. Countermeasures by tempo tier:
- **Tempo ≥160 (fast tunes)**: pure eighths work as-is;
- **Tempo 120–140** → use **triplets**:
  - **Add 1 note** to a pair of eighths to make a triplet; the added note can be in-scale or **mix in a chromatic** (e.g. ラ ラ♯シド(triplet) レ ミ; descending ドシ シ♭ラ(triplet) ソ);
  - One triplet placed somewhere gives the rhythm shading (緩急) and the phrase instantly becomes interesting;
  - Caution: don't let the eighths after the triplet get dragged along (don't over-bounce / over-swing); return faithfully to steady eighths;
- **Tempo ≤120** → use **sixteenth notes**:
  - **Add 2 notes** to a pair of eighths to make a 16th group — the essential tool for cool phrases at slow tempos;
  - Besides scale runs, **repeated-note ornamental figures (trill-like)** are highly effective, and technically easy on most instruments;
  - Eighth-note phrases should avoid note repetition, but **16ths move fast enough that repeated notes are safe**;
  - Drawback: easy to rush (ハシる) — train solid tempo-keeping ability.
- **One line, four uses**: from the same "source line" (元になる線) make:
  1. An approach-note version (pure eighths, imagining a faster tempo — if you can insert approach notes freely at speed, the jazz feel is in place);
  2. A triplet version (combined with chromatics);
  3. A 16th version (ornamental-figure approach);
  4. A mixed version of all three (the culmination) — once you can freely manipulate rhythm, **you can produce swing feel even on slow tunes**.
  - One line yields at least 4 distinct phrases; the four techniques change only "density and drive", never the line's narrative.
- Commercial phrase books sound stiff when copied verbatim (取ってつけたような感じ, "tacked-on"), usually because their assumed tempo is faster than yours — rescue them with the same technique by **adding notes** (converting parts to triplets/16ths).

### 5.3 Starting with Rests (休符で印象を変える)

- **Eighth-rest opening**: delete the first note and replace it with an eighth rest → **starting on the offbeat (ウラ拍始まり) = the classic (定番) form of jazz phrasing**.
  - Rule: **produce more offbeat openings than on-beat openings, and the swing feel comes out easily**;
  - Variant 1: continue straight after the rest (1 note deleted);
  - Variant 2: keep 2 beats / 4 notes — open with **eighth rest + eighth note + triplet** (a stock jazz opening rhythm — must be mastered);
  - Variant 3 (slower tempos): squeeze the first half-beat into "eighth rest + sixteenth notes", adding drive to the phrase.
- **Quarter-rest opening**: a phrase **need not start on beat 1**:
  - Start from beat 2 after the rest (2 notes deleted — the note reduction itself creates rhythmic variety);
  - Or, after the rest, compress the original first 4 notes into sixteenths — an especially effective sense of acceleration in slow tunes.
- Caution: **feel the rests solidly; do not let the rhythm rush (ハシる)**.

### 5.4 Parallel Shifting (平行移動: long rests and crossing barlines)

- **Being able to make phrases that cross the barline is a threshold for improvisation to leave beginner level.**
- Technique: add a **long rest** at the phrase head and **parallel-shift (平行移動)** the whole phrase later in time — starting/ending from different positions, it naturally crosses the barline.
- Theoretical guarantee: in the line method the on-beats are basically in-scale notes, so **shifting by 2 beats still works**; even if it drifts off the chord tones, as long as it stays in the Key there is almost no awkwardness.
- Shift amount and character:
  - **Rest 2 beats**: still departs from a strong beat (beat 3) — the strong/weak character is unchanged;
  - **Rest 3 beats**: starts from a **weak beat (beat 4)** → the impression changes completely (floating feel);
  - **Rest 4 beats**: starts from a **weak measure (even-numbered measure)** → the same phrase shows yet another face.
- **Beginners always start phrases from "strong" positions** — go back and check where your phrases begin, and use parallel shifting to build the habit of also starting from "weak" positions.
- Shifting within a chord progression: chords and Key stay put while only the phrase slides along the time axis — one piece of material, many different sounds.

### 5.5 Breathing (息継ぎ) and Long Rests

- Actively insert long rests of **2 beats or more — enough for a genuine breath**; the point is to **be conscious of breathing**:
  - Wind players must rest when out of breath (breathing = rests); keyboards/strings can play nonstop, but **nonstop ≠ good**;
  - **Listeners breathe along with the player's phrases** — phrases that run too long leave the listener "unable to catch a breath", like conversing with someone who never stops talking; gaps are needed.
- The "oishii basho" (オイシイ場所, sweet spot) for long rests = **beats 2–3**:
  - A rest landing on beats 2–3 makes the phrase naturally cross the barline — rest and barline-crossing in one;
  - Combine with drawing lines that **cross from an even measure into an odd measure** for even better effect.
- Beginners rest too little and too briefly (when playing poorly they panic, "want to fill in notes", and dare not rest):
  - **Playing by the line avoids this: wherever the line isn't drawn, rest with full commitment.**

### 5.6 Long Phrases and Multiple Lines

- **The 5-second wall**: on fast tunes phrase durations inevitably shrink; short phrases alone leave listeners "underfed" — the faster the tempo, the more long phrases are needed:
  - Goal: one phrase **≥5 seconds** (tempo 120 ≈ 10 beats / 2.5 measures; tempo 180 ≈ 15 beats / nearly 4 measures);
  - First aim for **4–5 measures**; step one: **build 4+ measures using only eighth notes**;
  - At slow tempos 5 seconds is easy to reach, but demands solid swing feel — then mix in triplets/16ths for rhythmic variety.
- Within long phrases: **align beat 1's on-beat of every measure to a chord tone** (longer phrases naturally mean more alignment points); work approach notes in as well.
- **Laying out multiple lines (線を複数にする)**:
  - **Make lines cross barlines as much as possible** — lines all contained within measures = easy to play but boring for the audience; ideally barline-crossing lines are the majority (not every line must cross);
  - **Starting a line from an even (weak) measure and crossing over reads as cool most easily**;
  - Vary the lengths: for starters, **draw 2 short lines, then 1 long line**;
  - Each line's rhythm should differ (short lines have few notes and turn monotonous → mix in triplets/16ths; long lines also have room inside for rhythmic ideas).
- **Motif (モチーフ)**:
  - A motif = a short fragmentary melody; **repeat a memorable melody verbatim several times** to give the audience a strong impression and to set up later phrase development;
  - Line-drawing knack: **draw 2–3 similar short lines with long rests between them** — the motif feel (recognizability) is stronger;
  - Advanced: draw the motif line itself across barlines, offsetting its measure position at each appearance — repetitive yet never stiff;
  - "Developing outward from a motif" is an effective construction method for long solos (motif builds tension, then a long line unleashes it in one stroke).

## 6. Scale Selection (スケールの使い分け)

### 6.1 Pentatonic Scale (ペンタトニック・スケール)

- **C major pentatonic (Cメジャー・ペンタ)** = ド レ ミ ソ ラ (C D E G A);
- **A minor pentatonic (Aマイナー・ペンタ)** = ラ ド レ ミ ソ (A C D E G) — **exactly the same notes as C major pentatonic** (relative major/minor share it).
- 5 notes, no half-step motion in the melody → naturally "melodic", suited to singable phrases.
- Rules for drawing lines with pentatonics (since there are only 5 notes):
  - **Avoid steep ascents and descents** (the intervals leap too wide);
  - Use **flat-flavored lines** instead, and **deliberately increase repeated notes**;
  - Adding **rhythmic ideas** best exploits the pentatonic's strengths (riff-like repetition, e.g. ド ド ラ ド ド ラ ド ド｜ラ ド レ ミ ド ラ ソ ミ);
  - Gake within flat lines are fine — **a gake on the offbeat (ウラ拍) is the classic move for show-off phrases**.
- Applied trick: over a C chord, deliberately play "**thinking in A minor pentatonic**" → the phrase's character changes (darker / more bluesy).
- Weaknesses:
  - Extremely effective over triad accompaniment and one-chord (ワン・コード) tunes (smooth jazz / fusion);
  - **Jazz is full of four-note chords like △7, where the half-step-bearing major scale actually makes cool phrases more easily** — pentatonics don't suit the modern-jazz main arena of rapidly changing harmony.

### 6.2 Blues Scale (ブルース・スケール)

- **A blues scale (Aブルース・スケール)** = ラ ド レ **レ♯** ミ ソ (A C D **D♯** E G) = A minor pentatonic + the **blue note (ブルーノート)** ♯4/♭5.
- Extremely wide usage:
  - **As long as the root matches, it works over both major and minor chords** (A blues works over A7 and also over Am);
  - **The relative key also works** (A blues holds up in an Am tune or a C-major tune);
  - The same phrase works over both A7 and C△7, with the blue note レ♯ as passing color.

### 6.3 The Three Minor Scales (マイナー・スケール) ★ Determined by How the II–V Is Written

| Scale | Notes (in A) | Color | Usage |
|---|---|---|---|
| **Natural minor (ナチュラル・マイナー)** | A B C D E F G | Soft, dark | **Im7 (○m7 explicitly marked to the 7th)** — the m7's ♭7th exists only in natural minor (a raised 7th degree clashes with the chord's ♭7) |
| **Harmonic minor (ハーモニック・マイナー)** | A B C D E F **G♯** | ソ♯ brings a suspended/exotic feel | **IIm7(♭5)–V7–Im minor two-five** (Bm7♭5–E7–Am) — the characteristic note ソ♯ is exactly E7's 3rd |
| **Melodic minor (メロディック・マイナー)** | A B C D E **F♯ G♯** | Smooth ascent; bright tension close to major | **IIm7–V7–Im** (Bm7–E7–Am, II without ♭5, common in standards) — ファ♯ and ソ♯ are Bm7's 5th and E7's 3rd respectively |

- **Mnemonic**: read the II–V's notation to pick the scale —
  - IIm7(♭5) ⇒ harmonic minor;
  - IIm7 (no ♭5) ⇒ melodic minor;
  - Resting on Im7 ⇒ natural minor.
- When the accompaniment is a triad (Am), all three match the chord tones — the player chooses freely.

### 6.4 Three Scales over the Dominant 7(♭9) (○7(♭9), G7 as example)

| Scale | Notes on G | Traits |
|---|---|---|
| **Mixolydian ♭9,♭13 (ミクソリディアン♭9,♭13)** (a.k.a. HMP5↓) | G A♭ B C D E♭ F | **Identical to the C harmonic minor a perfect 5th below**; the ♭9/♭13 tensions were fashionable in the bebop era — Charlie Parker and others used it constantly |
| **Altered scale (オルタード・スケール)** | G A♭ A♯ B C♯ E♭ F | **Contains every altered tension: ♭9・♯9・♯11・♭13**; identical to the A♭ melodic minor a half step above → carries a scale-out (スケール・アウト) tinge, the most "outside" |
| **Kon-dimi (コンディミ, half-whole diminished / ハーフ・ホール・ディミニッシュ, combination of diminished)** | G A♭ A♯ B C♯ D E F (8 notes) | The regular half-whole alternation → often used for **mechanical (メカニカル) pattern** phrases; retains the natural 5th and major 13th → slightly "brighter" than altered |

- Distinguish the two diminished-scale orderings: **whole-half (ホール・ハーフ) → for dim chords**; **half-whole (ハーフ・ホール) = kon-dimi → for dominant 7th chords**.
- In practice (Dm7–G7(♭5)–C△7): **the alteration happens only in the V7 measure** — measures 1 and 3 stay completely untouched, and the resolution note lands back on a C△7 chord tone;
  - Learning approach: no need to memorize note by note — grasp "same contour, only the V7 measure's characteristic-note slots swapped" and

…(truncated)