I've got a pandora station that never fails because I've been curating and like/disliking stuff on it for like 10 years. It's heavier riffy stuff a la sabbath, clutch, motorhead, kyuss. Typically my go to when working out or trying to get shit done.
Other than that my top few sirius stations would be the Grateful Dead channel, Jam On, Outlaw Country, Lithium, the classic punk channel, and Tom Petty's channel. So depending on whether I'm lifting, wrenching, or relaxing, I've got my bases pretty well covered.