Circle of Fifths

The circle of fifths arranges all 12 major keys a fifth apart:

C → G → D → A → E → B → F♯/G♭ → D♭ → A♭ → E♭ → B♭ → F → C

Clockwise: each key adds one sharp. Counterclockwise: each key adds one flat.

C major (top) has no accidentals.