Circle of Fifths is a clean, fast reference for musicians, songwriters, and students. Turn the wheel to any key and instantly see its key signature and the seven chords that belong to it. Chords are colour-coded by function (tonic, subdominant, dominant), so the structure of the key is clear at a glance. - Major and minor keys, with relative keys and correct note spelling (F sharp vs G flat) - Hear every chord, and the full scale, with a built-in piano sound - Piano keyboard showing the notes