The Circle of Fifths (also called the “Cycle of Fifths” or “Circle of Fourths”) is a powerful tool from music theory. It’s a way of thinking about the relationship between notes and chords that go together in music. Learning the Circle of Fifths helps you to more easily play by ear or improvise, by understanding the musical connections between notes and the chords.

The circle includes all 12 notes in the Western pitch system and arranges them in a musically meaningful way