I had to go with Floyd, just because they were such an integral part of my formative years, not to mention I host a show featuring their music. But, tough choice between them and Crimson, and I mean the REAL Crimson from 69-74. Gotta love a band that had TWO Mellotrons on stage during their live shows. And Lake and Wetton are without a doubt two of the great prog, oh hell, ROCK singers of all time. Gilmour ain't such a slouch in the vocals department either.