Some of the Best Guitar Riffs of the 21st Century (so far) have been written by The White Stripes, Queens of the Stone Age, The Strokes, and more.

Mayer was due to perform with the British trio, but first Summers had to help him tackle a song he had struggled with himself ...

Backstage footage from 2007's Live Earth benefit concert shows the Police guitarist rehearsing with Mayer and Kanye West ...