Theory · Keys
See how keys sit next to each other.
Move around the circle by fifths, compare relative minors and inspect the diatonic chords inside each major key.
FifthsCA minor
Selected key
C major
Relative minor: A minor
IC
iiDm
iiiEm
IVF
VG
viAm
vii°Bdim
Move clockwise for a perfect fifth. Adjacent keys share most of their notes and often move naturally in harmony.
How to read it
Nearby keys share more notes.
Clockwise movement adds a sharp; counter-clockwise movement adds a flat. The inner label shows the relative minor, which uses the same key signature as its paired major key.
Select a key to see its seven diatonic triads. This makes the circle useful for harmony and modulation rather than just memorizing key signatures.