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Reference tones (standard tuning)
Custom signatures click one accented beat per bar at the numerator count — e.g. 7/8 clicks 7 evenly-spaced beats, accenting the first.
Load a PDF or image of your tab or sheet music. Step 1: click "Set Bar Length", then click the start and the end of exactly one bar — that sets its width (shown in blue, marked "T"; it's just a ruler and isn't counted when you calibrate or play back). Step 2: click "Fill Bars", then click the start and end of the rest of the line — same-width numbered bars get stamped left to right in one go. (Two ordinary clicks each time — no dragging needed.) Calibrate the beat-length of each bar by tapping along with a click track, then play back at any tempo — a cursor sweeps horizontally through each bar in time with your playing, then jumps to the next. Nothing is uploaded; the file stays in your browser.
How to use the circle of fifths
- Layout: keys are arranged so each neighbor is a perfect fifth away and differs by exactly one sharp or flat. Going clockwise from C adds sharps (F♯, then C♯, then G♯...); going counter-clockwise adds flats (B♭, then E♭, then A♭...).
- Key signature: click a key on the outer ring to see exactly which sharps or flats it uses.
- Relative minor: the inner ring shows each major key's relative minor — same key signature, same notes, just a different "home" note (the 6th degree of the major scale).
- Finding related keys: a key's two neighbors on the wheel (one clockwise, one counter-clockwise) are its most closely related keys — they share almost all the same notes and chords, which makes them natural places to modulate to, or to borrow a chord from for a bit of colour.
- Building progressions: the 7 chords shown for a selected key are its diatonic chords — every chord you can build using only that key's notes. Progressions like I–IV–V or ii–V–I are built directly from this list.
Diatonic chords in this key
Closely related keys