Tools

Reference you can play with. Nothing here is graded or saved — look something up, hear how it sounds, and get back to playing.

Look it up

Reference you can hear. Name a key, a scale or a chord and it is spelled out for you, on the staff and on the keyboard.

Circle of fifths
Every key, arranged so that its closest relatives are its neighbours. Pick a key to see its signature, its relative and parallel minors, and the two keys either side of it.
Scales
Any scale from any root, spelled the way the theory requires — on the staff, on the keyboard, and out loud.
Chords
Build a chord and see it written, or hold notes on the keyboard and find out what you are playing.
Intervals
The distance between two notes — how it is counted, what it is called, and why the spelling is not a choice.
Glossary
Every term the lessons use, explained in full. Click a term inside a lesson for the short version.

While you play

Point these at your instrument — a beat to keep, a pitch to match, a neck to find notes on.

Try it out

Give one of these something to work with and it hands you something back — a question to answer, or a piece in a new key.