Circle of fifths
All 24 keys at a glance — major on the outside, the relative minor within. Tap a key to see its notes.
Clockwise from C, each step adds a sharp; counter-clockwise, each step adds a flat.
Anotona does this for you
Photograph a page of sheet music or play the melody — Anotona finds the key, engraves the notes and transposes them into any other. Free.
See AnotonaEvery note on this page is computed, not typed in — following the rule that also makes F# major spell its seventh degree E#, not F.