Music Theory Reference

Understand music, one concept at a time.

ChordBase is a growing reference for musicians and composers. Explore practical, clear guides to scales, chords, keys, and more — for any instrument.

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Everything you need to understand music theory from the ground up.

ScalesMajor, minor, modes, and more — in every key.
ChordsTriads, seventh chords, and extensions. — coming soon
IntervalsThe building blocks of melody and harmony. — coming soon