Harmonious

The Exhaustive Piano & Guitar Chord & Scale App

For Students, Composers, Songwriters, Arrangers & Working Musicians

What if you could learn music theory from a mentor that had all the answers? Start with what you know and follow your curiosity, confident that you have all musical options at your disposal, since Harmonious is the most complete chord and scale map.* Harmonious is a map of all chromatic-cluster-free hexatonic, heptatonic, and octotonic scales and modes and their compatible chords (Levine 1995) in twelve-tone equal temperament. Find extensions, substitutions and chromatic flavors that lie at the edge of the familiar and the exotic. See connections through the dual lens of chords and scales, linking harmony and melody.

OK, got it ✕

Small treble clef

Click or tap any icon of a key signature to go to the key page and learn the chords for that key.

Bass and treble clefs

Click or tap any icon of a grand staff to go to the interactive keyboard search page for the chord and to learn other ways to play similar things.

Bass clef

Click or tap any icon of a chord in the bass clef to go to the chord page and learn other ways to play it on keyboard or fretboard.

Fretboard grid

Click or tap any guitar finger position diagram to go to the interactive fretboard search page for those notes and to learn about the chord, including other ways to play similar things.

Clock diagram

Click or tap any black and white set class diagram to go to the set class page and learn the musical set theory behind that note pattern.

Roman numeral polygon

Click or tap any hollow polygon with Roman numeral to go to the mode page and learn about the ordered set of notes making up that mode, and compatible chords for the mode.

Filled polygon

Click or tap any color-filled polygon to go to the scale page and learn about the unordered set of notes making up that scale and the modes of that scale.