If you havent heard of them, you are definitely missing out. they are amazing. one of the best jazz/rock bands ever, in my opinion

heres a couple videos:

this ones from their somewhat early carreer:

http://www.youtube.com/watch?v=ZrcOEoFttWU

Song: Facelift(only the very end, sry), and then some weird vocal improv stuff

heres from their later, more fusion-centered time period:
"hazard profile"

http://www.youtube.com/watch?v=1LlmOfSWQIQ

part 2

http://www.youtube.com/watch?v=52yeumLkfKI