Circle of Fifths
Each step clockwise is a 5th up and adds a sharp (or removes a flat). Neighbouring keys share all but one note, which is why music moves so easily between them. Pick a key to see its signature and chords.
Majors on the outside, relative minors inside. The shaded block holds the six main chords of the key: I, IV and V with their relative minors vi, ii and iii.
C major
No sharps or flats
Key signature
Sharps are always added in the order F C G D A E B.