The Circle of Fifths
Every key, its signature and its relative minor, arranged so that neighbours are closely related. It's the single most useful map a young composer can carry — for finding keys, changing key smoothly, and building chord progressions.
How to use it while composing
- Find a key signature fast. Count the steps from C around the circle to know how many sharps or flats a key has.
- Change key smoothly. Neighbouring keys share the most notes, so modulating to one next door sounds natural.
- Pick a relative minor. Drop to the inner ring for a darker version of a major-key idea — same key signature, different mood.
- Build chord progressions. Many favourites (like I–IV–V) use chords that sit close together on the circle.