He is an animal set free on stage, completely in the flow of his art yet you only have to watch the video below to see what an incredibly good guy he is. (Maybe not always as he is human, but he makes being nice look effortless). Also proving you don't  have to wear linnen and beads to be Zen....
...Dave Grohl is incredibly talented, yet seems so down to earth.
Number #1 on this list as he epitomises a Zen balance of fame and humbleness.
A rock star without an ego.