Rolling Stone named Sgt Pepper the Greatest Album Of All Time in 2003 and it's often considered to be a key moment in the development of prog rock, art rock and using production techniques as an art form.

But Richards tells Esquire: "The Beatles sounded great when they were the Beatles. But there's not a lot of roots in that music. I think they got carried away. Why not? If you're the Beatles in the '60s, you just get carried away-you forget what it is you wanted to do. You're starting to do Sgt. Pepper.