Original Singer: Syd Barrett
Reason for Departure: Barrett's mental state rapidly deteriorated following the release of Pink Floyd's debut album, the mesmerizing "The Piper at the Gates of Dawn," and by the end of the subsequent tour he was nearly catatonic onstage.
The Replacement: David Gilmour
David Gilmour was added as a fifth member while Barrett was still in the band. Following the singer's dismissal, Gilmour was slotted as the new frontman, while Roger Waters took over primary songwriting duties. The band emerged virtually unscathed, especially in America, where it had yet to truly establish a following. —Jeff Royer
(Photos: Keystone Features, Getty Images; Gareth Cattermole, Getty Images)
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