Circle of fifths on guitar

Circle of Fifths

The circle of fifths is an invaluable tool that reveals important relationships between pitches and organizes them in a way that’s very useful to understanding diatonic harmony.

Les Paul guitar fretboard
Jimi Hendrix playing the guitar on stage Marjut Valakivi / Public domain
Warren Haynes - Soulshine songwriter, Allman Brothers Band pitpony.photography [CC BY-SA]
John Frusciante of Red Hot Chili Peppers playing guitar Flickr photographer Chad Carson [CC BY-SA 2.0], via Wikimedia Commons