John Mayer is legend. Not interested in your debates over the best guitar players etc, because they have nothing to do with this.
http://www.youtube.com/watch?v=IEE2_RYyVYk
http://www.youtube.com/watch?v=AzsEzD2fVwE
http://www.youtube.com/watch?v=WLgKNjI4f_I

And a great fan rendition of a thrice song on piano.
http://www.youtube.com/watch?v=eAv59EnBWQI