With the release of 1973�s The Dark Side of the Moon, Pink Floyd abruptly went from a moderately successful acid-rock band to one of pop music�s biggest acts. The recording, in fact, remained on Billboard�s Top 200 album chart longer than any other release in history. Along with 1979�s The Wall, it established the band as purveyors of a distinctively dark vision. Experimenting with concept albums and studio technology and breaking free of conventional pop song formats, Pink Floyd prefigured the progressive rock of the Seventies and ambient music of the Eighties.

As early as 1964 Pink Floyd�s original members, except Syd Barrett, were together studying architecture at London�s Regent Street Polytechnic School. With Barrett, an art student who coined the name the Pink Floyd Sound after a favorite blues record by Pink Anderson and Floyd Council, they began playing R&B-based material for schoolmates. By 1967 they had developed an unmistakably psychedelic sound: long, loud suitelike compositions that touched on hard rock, blues, country, folk, electronic, and quasi-classical music. Adding a slide and light show, one of the first in British rock, they became a sensation among London�s underground as a featured attraction at the UFO Club. Barrett, who was responsible for most of the band�s early material, had a knack for composing singles-length hits of psychedelia, and Pink Floyd had British hits with two of them in 1967: "Arnold Layne," the tale of a transvestite (#20 U.K.), and "See Emily Play" (#6 U.K.). The latter, however, was the last U.K. hit single they would have for over a decade; space-epic titles like "Astronomy Domine" and "Interstellar Overdrive" were more typical.

In 1968 Barrett, allegedly because of an excess of LSD experimentation, began to exhibit ever more strange and erratic behavior. David Gilmour joined to help with the guitar work. Barrett appeared on only one track of Secrets, "Jugband Music," which aptly summed up his mental state: "I�m most obliged to you for making it clear/That I�m not really here." He left the band, entered a hospital, and remained in seclusion. Without Barrett to create concise psychedelic singles, the band concentrated on wider-ranging psychedelic epics.

From 1969 to 1972 Pink Floyd made several film soundtracks -- the most dramatic being Zabriskie Point, in which Michelangelo Antonioni�s closing sequence of explosions was complemented by Floyd�s "Careful with That Axe, Eugene"-- and began using in concert its "azimuth coordinated sound system," a sophisticated 360-degree P.A. With Atom Heart Mother, they topped the British chart in 1970; stateside success, however, still eluded them.

Their breakthrough came in 1973 with The Dark Side of the Moon. The themes were unremittingly bleak -- alienation, paranoia, schizophrenia -- and the music was at once sterile and doomy. Taped voices mumbling ominous asides (something the band had used before) surfaced at key moments. Yielding a surprise American hit in "Money," (#13,1973), the album went on to mammoth long-running sales success. Ultimately remaining on the Billboard Top 200 album chart for 741 weeks, Dark Side showcased the talents of Pink Floyd�s chief members: Waters� lyrics, Gilmour�s guitar. The two would continue to dominate the band but soon furiously contend against each other.

The group�s subsequent albums explored the same territory, with Waters� songs growing ever more bitter. Wish You Were Here (#1, 1975) was dedicated to Barrett and elegized him with "Shine On You Crazy Diamond." The Wall, Waters� finest moment, topped the U.S. chart for 15 weeks, while its nihilistic hit, "Another Brick in the Wall," was banned by the BBC and in 1980 became the band�s only #1 American single. Meanwhile Pink Floyd�s stage shows had become increasingly elaborate. For the Dark Side and Wish tours, there were slide/light shows and animated films, plus a giant inflated jet that crashed into the stage; for Animals, huge inflated pigs hovered over the stadiums; for The Wall (due to enormous expense, performed 29 times only in New York, Los Angeles, and London) there was an actual wall built, brick by brick, across the stage, eventually obscuring the band from audience view. Shortly thereafter, Wright left, due to conflict with Waters.

With The Final Cut (#6, 1983), subtitled "a requiem for the postwar dream," Waters penned his darkest work yet. It also marked the effective end of the original Pink Floyd, with Waters bitterly departing, and Gilmour and Mason cementing their alliance.

(Two films related to the original band -- minus Barrett -- have been made: the documentary Pink Floyd Live At Pompeii [1971] and The Wall [1982]. The latter featured stunning animation by Gerald Scarfe -- Bob Geldof starred in the live-action sequences -- and illustrated music from Pink Floyd�s LP of the same name. The first remains a cult movie; the second was a massive commercial success.)

In 1978, with Gilmour�s David Gilmour and Wright�s Wet Dream, Pink Floyd�s members had started releasing solo albums. Mason had begun a sideline career as a producer in 1974 with Robert Wyatt; ultimately his very diverse roster included Gong, Carla Bley, the Damned, and Steve Hillage. Solo work continued in the Eighties: In 1984 came Waters� The Pros and Cons of Hitch Hiking, Wright�s Identity and Gilmour�s About Face (with lyrical contributions by Pete Townshend). A year later Mason released Profiles. Concurrently, Gilmour played sessions with Bryan Ferry, Grace Jones, and Arcadia; in 1986 he formed David Gilmour & Friends with Bad Company�s Mick Ralphs.

In 1986 Waters brought suit against Gilmour and Mason, asking the court to dissolve the trio�s partnership and to block them from using the name Pink Floyd. A year later Waters lost his suit, and the other members, as Pink Floyd, released Momentary Lapse of Reason (#3, 1987). As Waters put out his own Radio K.A.O.S., the others launched a Pink Floyd tour that grossed nearly $30 million. (Though Wright was included on the tour and album, he wasn�t legally considered an official band member but a salaried employee.) With the live Delicate Sound of Thunder Gilmour, Mason, and Wright again billed themselves as Pink Floyd and went on to more successful touring, including a gig performed in Venice aboard a giant barge that was televised worldwide.

In 1990 Waters presented an all-star cast, including Sinead O�Connor, Joni Mitchell, and Van Morrison, in a version of The Wall performed at the site of the Berlin Wall (chronicled in The Wall -- Live in Berlin). Two years later he released the dour Amused to Death.

With Wright rejoining Gilmour and Mason as a full band member, Pink Floyd garnered immediate success with The Division Bell in 1994. Named after the bell in the British House of Commons that summons members to parliamentary debate, the album featured songs written by Gilmour in collaboration with his ex-journalist girlfriend Polly Samson. Two weeks after its release, The Division Bell shot to #1 on the album chart, and in late spring the band embarked on an elaborate tour, which attracted over five million fans. "Marooned," from Division Bell, won the 1994 Grammy for Best Rock Instrumental Performance.

Pulse (#1, 1995) documented the �94 tour, including a live performance of Dark Side of the Moon in its entirety.

Formed 1965, London, England