Harmony
The ii V I Progression in Major, Minor and Jazz Styles
Why ii V I is the backbone of tonal music: voice leading, turnarounds, minor-key forms, and the jazz reharm toolkit.
Search
Type a chord symbol or a scale name and go straight to it, or search tools, glossary terms and every article. Results are ranked by where the words appear.
Glossary
Articles
Form
The Twelve-Bar Blues: Form, Chord Plan and Variations
Twelve bars of 4/4 in three four-bar phrases, moving through I, IV and V. The standard plan in C and F, the quick change, the turnaround and the minor blues.
Harmony
Tritone Substitution: The subV7 Chord That Still Resolves
Replace any dominant with the dominant a tritone away: why subV7 works, how it smooths bass lines, and where jazz standards hide it.
Fundamentals
Circle of Fifths Explained: Keys, Signatures, Changes
The circle of fifths organizes every key by signature and closeness. How to read it, memorize it, and use it for modulation and chord choice.
Harmony
Harmonic Sequences and Circle Progressions That Modulate
Descending fifths, ascending 5-6 patterns, Pachelbel loops: how sequences work, when they modulate, and how to write them.