Just don't tell Roger Waters that. He, and HE ALONE, is Pink Floyd.
Actually he is Wall/Final Cut, with Gilmore singing background. I think that Waters sounds different that Gilmore/Wright/Barrett.
Way I see it, both Gilmore and Waters had pretty successful solo careers after Floyd (i know Gilmore carried on the name.. Comfortably Numb is not the same/lame without Waters), so..
Its a damn shame that they can't bury the hatchet (not in each other) and get back together.
And furthermore here are the arrangements for Comfortably Numb. I guess you could argue symantics about what is lead or not..but I aint going there.
Roger Waters â music, lyrics, vocals (verses) [13], bass guitar [13]
David Gilmour â music, vocals (bridge and refrain)[13], guitars[13], bass guitar[13], pedal steel guitar [13], Prophet-5 synthesizer [13]
Nick Mason â drums[13]
Richard Wright â organ [13]
Lee Ritenour â acoustic guitar