
Such calamities would have proven insurmountable for 99 out of 100 bands in similar predicaments. Incredibly, Pink Floyd would regroup and not only maintain their popularity, but eventually become even more successful. It was early in the game yet, after all; the first album had made the British Top Ten, but the group were still virtually unknown in America, where the loss of Syd Barrett meant nothing to the media. Gilmour was an excellent guitarist, and the band proved capable of writing enough original material to generate further ambitious albums, Waters eventually emerging as the dominant composer. The 1968 follow-up to Piper at the Gates of Dawn, A Saucerful of Secrets, made the British Top Ten, using Barrett's vision as an obvious blueprint, but taking a more formal, somber, and quasi-classical tone, especially in the long instrumental parts. Barrett, for his part, would go on to make a couple of interesting solo records before his mental problems instigated a retreat into
oblivion.

Over the next four years, Pink Floyd would continue to polish their brand of experimental rock, which married psychedelia with ever-grander arrangements on a Wagnerian operatic scale. Hidden underneath the pulsing, reverberant organs and guitars and insistently restated themes were subtle blues and pop influences that kept the material accessible to a wide audience. Abandoning the singles market, they concentrated on album-length works, and built a huge following in the progressive rock underground with constant touring in both Europe and North America. While LPs like Ummagumma (divided into live recordings and experimental outings by each member of the band), Atom Heart Mother (a collaboration with composer Ron Geesin), and More... (a film soundtrack) were erratic, each contained some extremely effective music.

By the early '70s Syd Barrett was a fading or nonexistent memory for most of Pink Floyd's fans, although the group, one could argue, never did match the brilliance of that somewhat anomalous 1967 debut. Meddle (1971) sharpened the band's sprawling epics into something more accessible, and polished the science-fiction ambience that the group had been exploring ever since 1968. Nothing, however, prepared Pink Floyd or their audience for the massive mainstream success of their 1973 album, Dark Side of the Moon, which made their brand of cosmic rock even more approachable with state-of-the-art production, more focused songwriting, an army of well-time stereophonic sound effects, and touches of saxophone and soulful female backup vocals.

Dark Side of the Moon finally broke Pink Floyd as superstars in the United States, where it made #1. More astonishingly, it made them one of the biggest-selling acts of all time. Dark Side of the Moon spent an incomprensible 741 weeks on the Billboard album chart. Additionally, the primarily instrumental textures of the songs helped make Dark Side of the Moon easily translatable on an international level, and the record became (and still is) one of the most popular rock albums worldwide.
It was also an extremely hard act to follow, although the follow-up, Wish You Were Here (1975), also made #1, highlighted by a tribute of sorts to the long-departed Barrett, "Shine on You Crazy Diamond." Dark Side of the Moon had been dominated by lyrical themes of insecurity, fear, and the cold sterility of modern life; Wish You Were Here and Animals (1977) developed these morose themes even more explicitly. By this time Waters was taking a firm hand over Pink Floyd's lyrical and musical vision, which was consolidated by The Wall (1979).