I expected it to be the youtube clip it was before I saw outofstyle’s comment, when I saw it I knew which one it had to be...
Some of my Favs.
Buckethead, Soothsayer
http://www.youtube.com/watch?v=adV8-_hgL4g
My Guitar Gently Weeps, Tom Petty irritated by Prince’s guitar solo!
http://www.youtube.com/watch?v=ifp_SVrlurY