Music theory taught through
the composers you love.
An open music-theory textbook where every harmony example comes from real repertoire — pick your favorite composers and the examples become theirs.
- Pick your favorite composers — Bach, Chopin, Beethoven, and more.
- Open any harmony lesson — 108 chapters across 11 units.
- The musical examples are theirs — notation you can hear, drawn from annotated scores.
Start by picking your favorite composers
I Fundamentals
- Introduction to Western Musical Notation
- Notation of Notes, Clefs, and Ledger Lines
- Reading Clefs
- The Keyboard and the Grand Staff
- Half Steps, Whole Steps, and Accidentals
- American Standard Pitch Notation
- Other Aspects of Notation
- Notating Rhythm
- Simple Meter and Time Signatures
- Compound Meter and Time Signatures
- Other Rhythmic Essentials ★ examples
- Major Scales, Scale Degrees, and Key Signatures ★ examples
- Minor Scales, Scale Degrees, and Key Signatures ★ examples
- Introduction to Diatonic Modes and the Chromatic Scale
- Intervals ★ examples
- Triads ★ examples
- Seventh Chords ★ examples
- Inversion
- Roman Numerals
- Figured Bass
- Texture
- Chords in SATB Style
II Counterpoint and Galant Schemas
- Introduction to Species Counterpoint
- First-Species Counterpoint
- Second-Species Counterpoint
- Third-Species Counterpoint
- Fourth-Species Counterpoint
- Fifth-Species Counterpoint
- 16th-Century Contrapuntal Style
- High Baroque Fugal Exposition
- Ground Bass
- Galant Schemas
- The Rule of the Octave and Harmonizing the Scale with Sequences
III Form
IV Diatonic Harmony, Tonicization, and Modulation
- Introduction to Harmony, Cadences, and Phrase Endings ★ examples
- Strengthening Endings with V7 ★ examples
- Strengthening Endings with Strong Predominants
- Embellishing Tones ★ examples
- Strengthening Endings with Cadential 6/4 ★ examples
- Prolonging Tonic with V6 and Inverted V7s ★ examples
- Performing Harmonic Analysis Using the Phrase Model
- Prolongation using the Leading-Tone Chord ★ examples
- 6/4 Chords as Forms of Prolongation
- Plagal Motion as a Form of Prolongation ★ examples
- La in the Bass
- The Mediant Harmonizing Mi in the Bass
- Predominant Seventh Chords ★ examples
- Diatonic Sequences
- Tonicization ★ examples
- Extended Tonicization and Modulation to Closely Related Keys
V Chromaticism
- Modal Mixture ★ examples
- Neapolitan Sixth Chords (♭II⁶) ★ examples
- Augmented Sixth Chords ★ examples
- Common-Tone Chords
- Harmonic Elision
- Chromatic Modulation
- Equal Divisions of the Octave
- Chromatic Sequences
- The Omnibus Progression
- Altered and Extended Chords
- Neo-Riemannian Triadic Progressions
- Mediants
VI Jazz
VII Popular Music
VIII 20th- and 21st-Century Techniques
IX Twelve-Tone Music
X Orchestration
XI Rhythm and Meter
- Hypermeter
- Metrical Dissonance ★ examples