# Music Theory > Master music theory fundamentals including scales, chords, harmony, counterpoint, and composition techniques for creating and analyzing musical works. - Skill: `majiayu000/music-theory` (Agent Skill, multi-file: 2 files) - Install (CLI): `npx skillmds add majiayu000/music-theory` - Raw SKILL.md: https://api.skillmd.com/api/skills/majiayu000/music-theory/raw - Safety review: pending - Works with: Claude Code, Claude.ai, OpenAI Codex - Category: Coding & Dev Tools - Author: majiayu000 (https://skillmd.com/u/majiayu000) - Updated: 2026-09-09 - Page: https://skillmd.com/skills/majiayu000/music-theory --- # Music Theory Comprehensive music theory for composition and analysis. ## Overview Music theory provides the foundational framework for understanding how music works, encompassing the study of harmony, melody, rhythm, scales, chords, and compositional techniques. This skill covers core concepts from basic intervals and scales to advanced harmonic progressions, counterpoint, and modulation strategies used in professional composition and arrangement. Understanding music theory enhances creativity, enables effective communication with other musicians, and provides tools for analyzing and creating music across all genres. The principles apply to classical composition, jazz improvisation, pop songwriting, film scoring, and electronic music production. ## Core Concepts ### Notes, Intervals, and Scales **Musical Alphabet** — Seven letters (A, B, C, D, E, F, G) repeat across octaves, with 12 distinct notes including sharps and flats in Western music **Intervals** — Distance between two notes measured in half steps or whole steps; described by number (2nd, 3rd, 5th) and quality (major, minor, perfect, augmented, diminished) **Scales** — Sets of notes within an octave arranged by pitch; major scales sound bright and happy, minor scales sound dark and emotional **Modes** — Variations of scales using the same notes but starting on different root notes, creating distinct melodic characteristics (Ionian, Dorian, Phrygian, Lydian, Mixolydian, Aeolian, Locrian) ### Chords and Harmony **Triads** — Basic three-note chords consisting of root, third, and fifth - **Major chords:** Root, major third, perfect fifth (bright, stable) - **Minor chords:** Root, minor third, perfect fifth (dark, emotional) - **Diminished chords:** Root, minor third, diminished fifth (tense, dramatic) - **Augmented chords:** Root, major third, augmented fifth (unsettling, mysterious) **Chord Extensions** — Notes added beyond the triad (7th, 9th, 11th, 13th) creating richer, more complex harmonies **Chord Inversions** — Variations created by transposing the bottom note to a higher octave, allowing smoother transitions **Consonance and Dissonance** — Consonant chords sound stable and pleasing; dissonant chords create tension and instability, typically resolving to consonance ### Harmonic Function **Tonic Chords** — "Home" chord of a key providing stability and resolution (I chord) **Dominant Chords** — Create anticipation and naturally resolve to tonic (V chord) **Predominant Chords** — Typically precede dominant chords, setting them up (IV and ii chords) **Roman Numeral Analysis** — System for indicating chords in progressions (uppercase for major, lowercase for minor) ## Professional Workflows ### Chord Progression Construction Common progressions provide structure and emotional movement: - **I-IV-V-I** — Classic progression in countless songs - **I-V-vi-IV** — Popular in contemporary pop music - **ii-V-I** — Jazz standard progression - **I-vi-IV-V** — Doo-wop and early rock progression ### Voice Leading Principles **Smooth Transitions** — Move individual melodic lines from one chord to the next with minimal jumps **Outer Voice Motion** — Avoid similar motion between highest and lowest notes, as the ear is particularly sensitive to these **Common Tones** — Hold notes that appear in consecutive chords for smoother connections **Contrary Motion** — Move voices in opposite directions for independence and interest ### Counterpoint Techniques **Independent Melodic Lines** — Create multiple melodies that work together harmonically while maintaining individual interest **Species Counterpoint** — Systematic approach to learning counterpoint through five species of increasing complexity **Polyphonic Texture** — Multiple independent voices creating rich harmonic tapestry ## Tools and Software ### Notation Software **Sibelius** — Professional notation software for composing, arranging, and publishing scores **Finale** — Comprehensive notation tool with extensive customization options **Dorico** — Modern notation software with intelligent layout and engraving **MuseScore** — Free, open-source notation software with robust features ### Theory Learning Tools **Teoria.js** — Interactive music theory exercises and ear training **musictheory.net** — Comprehensive online lessons and exercises **Perfect Ear** — Mobile app for ear training and theory practice **Tenuto** — iOS app for music theory drills and exercises ## Best Practices ### Composition Guidelines - Study scores of great composers to understand practical application - Analyze chord progressions in favorite songs to identify patterns - Practice voice leading with simple four-part harmony exercises - Experiment with modal interchange and borrowed chords for color - Use tension and release through dissonance and resolution ### Harmonic Analysis - Identify the key and scale degrees of each chord - Recognize functional harmony (tonic, dominant, predominant) - Note any non-diatonic chords and their function - Observe voice leading and melodic movement - Understand how harmony supports melody and form ### Practical Application - Apply theory knowledge to instrument practice - Use theory to communicate ideas with other musicians - Analyze music in various genres to broaden understanding - Compose regularly to internalize theoretical concepts - Balance theoretical knowledge with musical intuition ## Common Challenges ### Overly Academic Approach **Problem:** Theory becomes disconnected from practical music-making **Solution:** Always connect theoretical concepts to real music; analyze favorite songs and apply theory to composition and performance ### Memorization Without Understanding **Problem:** Knowing rules without understanding their musical purpose **Solution:** Focus on why rules exist and how they create musical effects; experiment with breaking rules intentionally ### Limited Genre Perspective **Problem:** Theory knowledge limited to classical or single genre **Solution:** Study theory applications across genres (jazz, pop, film, electronic); recognize that different styles use theory differently ### Difficulty Hearing Theory Concepts **Problem:** Understanding theory intellectually but not aurally **Solution:** Practice ear training alongside theory study; sing intervals, chords, and progressions; transcribe music by ear ## Using the Reference Files **`/references/fundamentals.md`** — Core theory concepts including intervals, scales, modes, chord construction, and basic harmonic principles. **`/references/advanced-techniques.md`** — Professional composition techniques including advanced harmony, modulation, counterpoint, and orchestration principles. **`/references/workflows-best-practices.md`** — Industry standards for notation, analysis methods, composition workflows, and genre-specific theory applications. **`/references/troubleshooting.md`** — Common theory problems including voice leading issues, harmonic confusion, and solutions with practical examples.