Warren Haynes - Soulshine songwriter and founding member of Govt Mule 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
Pink Floyd's David Gilmour playing guitar Photo by Jan Hagelskamp1
Guy playing scales on guitar
Man playing guitar chords

Chord Functions in the Major Keys

Chords within a given key have a function, or role they play within the key. Understanding these chord functions can help you understand why some chord progressions sound good while others sound not so good.