Trying to argue that Pink Floyd and Roger Waters have not influenced music is pretty damn ignorant. You want some proof? Listen to Phish, or any number of the swelling mass of "jam bands" coming out of the cracks nowadays. They had a big influence on many other "harder" bands, as well. They were out there, doing much more experimental things than many people were used to seeing at the time, starting entirely new trends in music. Whether they were the FIRST to do such things is irrelevant. They were the first to gain huge popularity and acknowledgement doing so.
Just because someone else may have done something similar to what Pink Floyd did before them, does not make them any less influential. Music is all about stealing other people's ideas and putting your own personal twist on them. If it wasn't for that, the only respectable musicians we'd know of were the Africans who started it all by banging on drums.
Furthermore, the thought of primitive music reminds me of the classical music which largely stemmed from Europe. People such as Mozart, Beethoven, Bach, and many others, have had WHOPPING influences upon modern music. I am bit surprised they have not been mentioned until now. Perhaps people were only thinking of what they know of for music, which is largely only what is in the public eye, such as that on the radio and television.
As much as I despise them as a band, I'd also contend that The Rolling Stones were very influential as well. Whether you like them or feel they did anything original, they certainly influenced many people, and as alasdair said, may have inspired others to pick up guitars and other instruments. In my opinion, that certainly qualifies as "shaping the future of music." I mean, for god's sake, according to Rolling Stone, they had the best song of the past century. Regardless of your feelings about that, the fact that a highly respected music magazine felt that way speaks volumes.
