First of all, let me say that I think Led Zeppelin may be one of the greatest bands of all time. There, I got that out of the way...
But...
Does anyone else find Plant's voice kind of grating? It has what I can only describe as a "squealing", quality to it. Perhaps it is his style of singing that makes Zeppelin the legends that they are, but I've always wondered how they would have sounded with a different voice than Plant's.