Greatest Rock Drummers

How about Terry Bozio? Listen to both Frank Zappa and the son's album, "Zappa Plays Zappa". Between Steve Vai, Terry and other FZ alumni, the drums really carry a lot of the songs. One example of Terry's prowess is the written for Jack Bruce to play song, Apostrophe, as well as that album and it's predecessor, "Overnight Sensation".

...which also has Jean-Luc Ponty.

My favorites, rock, jazz players who became rock drummers, and jazz (most are still alive):
Billy Cobham
Ginger Baker
John Bonham
Jack DeJohnette
Steve Gadd (great session drummer)
Mitch Mitchell (he really help make the Experience what it was)
Keith Moon
Airto Moreira (soft touch)
Joe Morello (I grew with him in Wilton, CT - worked with Dave Brubeck, unfortunately, lost his hearing)
Antonio Sánchez
Narada Michael Walden
Paul Wertico
Tony Williams
-Gerry

As a drummer myself, it's hard to pick one as the best because of the different styles of drumming and music. The list is a good start. I would like to add Dave Weckl ( listen to the Convergence cd ) and Vinnie Colaiuto. These are Jazz drummers, although VC did play on Jeff Beck's Live from Ronnie Scott's and Stings new cd. There is a lot out there to enjoy.