Click any key on the wheel to see its chords, scale, key signature and relative minor — and hear it played. Every key links straight to its chords and scale shapes.
Starting at C (top) and moving clockwise, each step goes up a fifth and adds one sharp to the key signature (G has 1♯, D has 2♯…). Moving counter-clockwise from C goes up a fourth and adds one flat (F has 1♭, B♭ has 2♭…). Keys next to each other on the circle share almost all their notes, so they sound great together — that's why so many songs move between neighboring keys.
The outer ring shows major keys; the inner ring shows each one's relative minor (same notes, different home base). Use it to find which chords belong together, pick a key to write in, or figure out where to modulate. Then jump to the chords in that key or its scale shapes.