Pink Floyd were an English rock band formed in London in 1965. Gaining a following as a psychedelic rock group, they were distinguished for their extended compositions, sonic experimentation, philosophical lyrics and elaborate live shows, and became a leading band of the progressive rock genre. They are one of the most commercially successful and influential bands in popular music history.

Pink Floyd were founded by students Syd Barrett (guitar, lead vocals), Nick Mason (drums), Roger Waters (bass guitar, vocals), and Richard Wright (keyboards, vocals). Under Barrett's leadership, they released two charting singles and a successful debut album, The Piper at the Gates of Dawn (1967). Guitarist and vocalist David Gilmour joined in December 1967; Barrett left in April 1968 due to deteriorating mental health. Waters became the primary lyricist and thematic leader, devising the concepts behind the albums The Dark Side of the Moon (1973), Wish You Were Here (1975), Animals (1977), The Wall (1979), and The Final Cut (1983). The band also composed several film scores.

Following personal tensions, Wright left Pink Floyd in 1979, followed by Waters in 1985. Gilmour and Mason continued as Pink Floyd, rejoined later by Wright. The three produced two more albums—A Momentary Lapse of Reason (1987) and The Division Bell (1994)—and toured both albums before entering a long period of inactivity. In 2005, all but Barrett reunited for a one-off performance at the global awareness event Live 8. Barrett died in 2006, and Wright in 2008. The last Pink Floyd studio album, The Endless River (2014), was based on unreleased material from the Division Bell recording sessions.

Pink Floyd were one of the first British psychedelia groups, and are credited with influencing genres such as progressive rock and ambient music. Four albums topped US or UK record charts; the songs "See Emily Play" (1967) and "Another Brick in the Wall, Part 2" (1979) were their only top 10 singles in either territory. The band were inducted into the US Rock and Roll Hall of Fame in 1996 and the UK Music Hall of Fame in 2005. By 2013, they had sold more than 250 million records worldwide, with The Dark Side of the Moon and The Wall two of the best-selling albums of all time.

How it came to be, and the concert rehearsals ! Pink Floyd, reunited with former bassist/lyricist Roger Waters for the first time in over 24 years.The complete foursome had not performed together since a show at Earls Court in London on 17 June 1981. Roger Waters' relationship with David Gilmour was so distant in the period before Pink Floyd's celebrated reunion at Live 8 that Waters had to ask organizer Bob Geldof for his former bandmate's phone number. While Geldof had been persistent in trying to broker peace between the pair, he'd hit an initial roadblock with Gilmour – who once referred to a possible detente as something akin to "sleeping with your ex-wife." Waters then interceded. Ultimately, the event's mission – Live 8 was meant to raise awareness of poverty, debt and the AIDS crisis in developing nations – led to one of music's most improbable remarriages, though only for a single evening. "The moment was bigger than those bad feelings," David Gilmour told the Associated Press in the days leading up to Pink Floyd's July 2, 2005, appearance. "Any squabbles Roger and the band have had in the past are so petty in this context, and if reforming for this concert will help focus attention, then it's going to be worthwhile." And so Pink Floyd's classic-era lineup – Gilmour, Nick Mason, Waters and Richard Wright – took the stage for the first time since a 1981 concert at Earl's Court in London and, alas, for the last time ever. "It's great to be asked to help Bob raise public awareness on the issues of third-world debt and poverty," Waters enthused as the day drew near. "The cynics will scoff. Screw 'em! Also, to be given the opportunity to put the band back together, even if it's only for a few numbers, is a big bonus." To no one's surprise, Pink Floyd's reunion eclipsed a star-packed lineup at the London Hyde Park show, which also included Paul McCartney, the Who, Elton John, Madonna, R.E.M., U2, Coldplay and Robbie Williams. Live 8, scheduled to sync up with the 20th anniversary of Live Aid, also featured six other events through July 6. Bon Jovi, Stevie Wonder, Dave Matthews, Jay-Z and others performed at Philadelphia. Brian Wilson, and Crosby Stills and Nash appeared in Berlin. Duran Duran and Tim McGraw were among the headliners in Rome. Annie Lennox performed at Edinburg as the G8 summit -- a gathering of international leaders where debt cancellation and aid would be discussed -- kicked off. For Pink Floyd, however, the most immediate concern was far more small scale: getting the songs right. "It's sort of assumed that we'll all remember how they go," Mason impishly admitted. By all accounts, everyone was on their best behavior as three days of pre-show rehearsals unfolded. "There were times when Roger was struggling to not get bossy, and I was struggling to keep being bossy," Gilmour said at the time. "I saw how arguments could have happened, but we aren't at each other's throats anymore. Getting rid of that acrimony has got to be a good thing. Who wants to have that fester in your mind the rest of your life Still, there was the matter of a set list. And it was there where the former bandmates – two decades after an ugly legal battle over the rights to the Pink Floyd name -- once again clashed. Gilmour steadfastly refused to play Pink Floyd's most recognizable radio hit, "Another Brick in the Wall," deeming its anti-education message inappropriate for the moment. "Anyway, I don't like it much. It's all right but not part of the great emotional oeuvre," Gilmour said, in a 2006 interview. "The songs that Roger wanted were not the ones I thought we should do. The arrangements of the songs were not the way Roger wanted to do them. But I kind of insisted." In the end, Pink Floyd were restricted, like all of the other artists performing at Live 8, to a short, 20-minute set. Even a reunion 24 years in the making was only a mere portion of the larger production. So the band settled on four songs: "Breathe" and "Money" from 1973's The Dark Side of the Moon, "Wish You Were Here" from the 1975 album of the same name and "Comfortably Numb" from 1979's The Wall, Pink Floyd's penultimate recording with Waters. They left aside music from the two Gilmour-led Pink Floyd albums that followed the acrimonious split. Waters made reference to the band's original leader, the late Syd Barrett, even as he framed the larger reasons Pink Floyd had decided to reunite. "It’s actually quite emotional to be standing up here with these three guys again, after all these years – standing to be counted with the rest of you," Waters said amid the opening strains of "Wish You Were Here." "Anyway, we're doing this for the people who're not here – and particularly, of course, for Syd." They finished with a somewhat awkward bow, but only after reaffirming Pink Floyd's former power and grace

Final "Echoes"performance with Richard Wright (Pink Floyd)