If a hippie goes to see a band and likes it, does that mean it is no longer a non-hippie band?
I'll just add in a few bands that I think might qualify , in no particular order:
California Guitar Trio, Pink Floyd, Black Sabbath, Led Zeppelin, Deep Purple, Galactic, Sly & the Family Stone, Bonnie Raitt, CAKE, Bob Marley, Lucky Dube, Steel Pulse, Johnny A, B-52s. Psychedelic Furs, Little Feat, King Crimson,
Okay this could go on and on and on.................