Re: John Bonham (Bonzo)
Just to put a cat among the pigeons, I once met a guy in London who used to do session work back in the late '60s, and his take on Bonham was that he got the credit for a movement that he wasn't entirely the innovator of - that there were a bunch of guys around London at the time working to bring the solidity and huge sound that Bonham had going into rock music, rather than the previous Mitch Mitchell-esque jazzy approach. Bonham was just the first of them to get really big, while the rest remained relatively unknown.
Of course, this is all anecdotal and I can't vouch for any of it.
Personally, I think Bonham is a great drummer. If you want to play rock music there's rarely an occasion where you actually need to use anything more than he did, and he did it all so well!