Editing Roger Waters (section)

===Formation and Barrett-led period===
[[File:Roger waters leeds 1970.jpg|thumb|upright=.75|left|Waters performing with Pink Floyd at [[Leeds University]] in 1970|alt=A monochrome image of Roger Waters playing bass guitar. He has shoulder-length hair, black attire, and is standing in front of a microphone.]]

By September 1963, Waters and Mason had lost interest in their studies and moved into the lower flat of Stanhope Gardens, owned by Mike Leonard, a part-time tutor at the Regent Street Polytechnic.<ref>{{harvnb|Blake|2008|p=40}}: (secondary source); {{harvnb|Mason|2005|p=20}}: (primary source).</ref> Waters, Mason and Wright first played music together in late 1963, in a band formed by the vocalist Keith Noble and bassist Clive Metcalfe.<ref>{{harvnb|Manning|2006|p=13}}: (secondary source); {{harvnb|Mason|2005|p=17}}: (primary source).</ref> They usually called themselves Sigma&nbsp;6, but also used the name the Meggadeaths.{{sfn|Povey|2008|p=13}} Waters played rhythm guitar, Mason played drums, Wright played any keyboard he could arrange to use, and Noble's sister Sheilagh provided occasional vocals.{{sfn|Mason|2005|pp=17–18}} In the early years the band performed during private functions and rehearsed in a [[tearoom]] in the basement of Regent Street Polytechnic.{{sfn|Mason|2005|pp=13–18}}

When Metcalfe and Noble left to form their own group in September 1963, the remaining members asked Barrett and the guitarist [[Bob Klose]] to join.<ref>{{harvnb|Mason|2005|p=18}}: (primary source); {{harvnb|Povey|2008|p=14}}: (secondary source).</ref> Waters switched to the bass. By January 1964, the group became known as the Abdabs, or the Screaming Abdabs.{{sfn|Povey|2008|p=14}} During late 1964, the band used the names Leonard's Lodgers, Spectrum Five, and eventually, the Tea Set.{{sfn|Povey|2008|pp= 18, 28}} In late 1965, the Tea Set had changed their name to the Pink Floyd Sound, later the Pink Floyd Blues Band and, by early 1966, Pink Floyd.<ref>{{harvnb|Mason|2005|pp=30–37}}: (primary source); {{harvnb|Povey|2008|p=32}}: (secondary source).</ref>

By early 1966, Barrett was Pink Floyd's frontman, guitarist, and songwriter.{{sfn|Mason|2005|p=87}} He wrote or co-wrote all but one track of their debut LP ''[[The Piper at the Gates of Dawn]]'', released in August 1967.{{sfn|Mason|2005|pp= 87–107}} Waters contributed the song "[[Take Up Thy Stethoscope and Walk]]" (his first sole writing credit) to the album.{{sfn|Blake|2008|p= 91}} By late 1967, Barrett's deteriorating mental health and increasingly erratic behaviour{{sfn|Blake|2008|pp=90–114}} rendered him "unable or unwilling"{{sfn|Mason|2005|p=129}} to continue in his capacity as Pink Floyd's songwriter and lead guitarist.{{sfn|Mason|2005|pp=87–107}} In early March 1968, to discuss the band's future, Barrett, Mason, Waters, and Wright met with the band's managers, [[Peter Jenner]] and [[Andrew King (music manager)|Andrew King]], of the rock music management company they had all founded, [[Blackhill Enterprises]]. Barrett agreed to leave Pink Floyd, and the band "agreed to Blackhill's entitlement in perpetuity" regarding "past activities".{{sfn|Mason|2005|p=105}} Their new manager, [[Steve O'Rourke]], made a formal announcement about the departure of Barrett and the arrival of Gilmour in April 1968.{{sfn|Mason|2005|p=106}}