An interactive spin on the classic circle of fifths. Decoder helps make music theory easier by offering an easy-to-digest, graphical representation of the structures in the music. It quickly organises keys, chords, notes, and scales according to what they have in common.

We even added in a little extra - the Quick Chords, a selection of 12 common chord progressions on the back. This way, you can see how chords are built up from the notes. Helping you get playing and applying your new circle of fifths knowledge.

Give it a spin! Try our Digital Decoder: Circle of Fifths