Tom Morello (Rage Against The Machine/Audioslave) has a degree from Harvard, and is a prominent social activist.

Greg Graffin (Bad Religion) has a PhD from Cornell in zoology and is a guest lecturer at UCLA when not on tour.

Edit: While he lacked much formal education, Lemmy was a prolific reader who was known to always be reading something, and was apparently well versed in WWII history specifically. Ozzy Osbourne once said that Lemmy crashed at his house for a week and he "drank all my booze, snorted all my coke, and read all my books."