Premise: Pink Floyd . Pink Floyd were founded in 1965 by students Syd Barrett on guitar and lead vocals , Nick Mason on drums , Roger Waters on bass and vocals , and Richard Wright on keyboards and vocals . Syd Barrett . Barrett was excluded from Pink Floyd in April 1968 after David Gilmour took over as their new guitarist , and was briefly hospitalised amid speculation of mental illness .
Hypothesis: Pink Floyd's lead singer was Syd Barrett.
Label: ENTAILMENT