Oops thought I had multiple votes, would have voted for Moon.
Peart's fine but combined w/ Entwistle's bass,Kieth gave "Who" tunes more bottom than ANY rock Quartet, before or since.
Also list suffers from the fallowing omissions, Gene Crupa (Hope I spelled that right .), Mitch Mitchell (Most progressive.) and, dare I say it, Ringo Star (sadly a very underrated talent.)