Rock drummers: If you haven't heard Art Tripp (of Captain Beefheart and The Magic Band) especially in person (I had the pleasure circa 1972 at USC and in the then in the semi-abandoned Fox West Coast Theater in Long Beach, CA), I recommend his work. I also like Ginger Baker and the recent documentary is very interesting and entertaining, too!
Great musicians who should have been famous except....
I'm throwing this out there as an example. My 16 yr old aspiring drummer son asked me if I had anything in the vinyl collection tonight... apparently the U Tube video tutorials finally got boring. He is really good and practices non stop but it was refreshing when he asked about ideas for sound. In a moment of 30 years past clarity I put on the B side of Van Halen 1984… Is Alex Van Halen the most under rated rock drummer of all time? And is there a better lead in to ANY rock vinyl side than that???