Music Theory, Refocused
Synchronize what you hear with what you see. When music theory gets fuzzy, come back here — a calm place to see scales, degrees, and spellings clearly.
Training
Library
Scale Explorer
Explore scales on treble and bass clefs by degree, interval, Pitch Name, and movable Do. Play scales too.
Chord Explorer
Explore triads and seventh chords on the staff, with inversions and degree labels. Play chords and hear each voice.
Fret & Key Maps
Map scales and chords directly onto guitar, bass, and keyboard fretboards — syncing your fingers with what you see. Click to hear the notes too.
Diatonics
See diatonic chords, available tensions, and functional analysis at a glance, key by key.
Music Terms Dictionary
A dictionary of music terms to support you as you learn music. Switch the display language to check Japanese–English and English–Japanese wording.