Ok, like I said, everyone was equally as important in the production of every song and album Floyd did. It wouldnt have been the same with any one of the 4 pieces missing. I think Botley said it best in an earlier post,
Roger Waters is Pink Floyd's bassist, David Gilmour is its guitarist, but they both switched roles at various times.

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"I know I'm not gonna sing every note in tune, I know the notes I play on bass will not be perfectly expressed or played in perfect time, but what will happen is I'm gonna be there, really be there, the real me, not something I pretend to be" - Roger Waters