With all of the discussion of drummers, I'm surprised no one has brought up the infamous "The Black Page #1" and the "easy teenage New York version," "The Black Page #2."
Terry Bozzio talked about playing it and said, "...it just sat on my music stand and for about 15 minutes every day for 2 weeks, before we would rehearse, I would work on it. And after 2 weeks I had it together and I played it for him. And he said, "Great!!" took it home, wrote the melody and the chord changes, brought it back in. And we all started playing it."