music-theory

name	music-theory
description	Master music theory fundamentals including scales, chords, harmony, counterpoint, and composition techniques for creating and analyzing musical works.

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.