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.
When You Know How to Play, But Not Where to Go Next.
Tonic Clef maps scales, chords, and progressions by degree and movable Do — so you stop memorizing 12 keys and start seeing one structure, transposed.
Training
Sight Reading BootcampUpdated
Sight reading practice on real staff notation. Practice mode adapts to your level; Survival keeps ramping up the difficulty.
Ear Trainer
Listen, then name the interval. Interval training only for now; chord drills and more are planned.
Guide Tone Master
An app for hearing 3rd / 7th guide-tone lines (+ roots) over various chord progressions while confirming them in solfège or pitch names.
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.
Diatonics
See diatonic chords, available tensions, and functional analysis at a glance, key by key.
Non-DiatonicsUpdated
See secondary dominants, substitute dominants (subV), and modal interchange as a table — the outside counterpart to Diatonics.
Music Terms DictionaryUpdated
A dictionary of music terms to support you as you learn music. Switch the display language to check Japanese–English and English–Japanese wording.
Tools
Lead Sheet Hub
Browse published charts, keep a personal lead-sheet library, import one song at a time, and open them in Guide Tone Master.
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.
Staff Paper Generator
Generate and download high-quality, customizable, blank staff paper in PDF format for your music theory and practice.
Sound Wave Visualizer
Add tones one by one and visualize in real time how the combined wave and spectrum change.