An undeniable classic. It was in response to and practically a cover of Bo Diddley's "I'm A Man":
http://www.youtube.com/watch?v=mm7gVvUuZkE
---------- Post added at 18:28 ---------- Previous post was at 18:23 ----------
Also, have a listen to this work of art by Willie Dixon:
http://www.youtube.com/watch?v=UcqqyL-Y6Go
That's how you play bass.