I'm gonna beat Gawain to the punch on this one, besides which I think he has overlooked the best musical category for far too long now.
Anyhow, I won't even bother with suggestions here, aside from the obvious Jefferson Airplane, probably the most influential hippie/psych band ever (and NO, the Beatles don't count! They were far too mainstream to be hippie or psychedelic. Plus they suck. )
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