"Progressive rock... psychedelic rock ... call it what you want, but before you define this band, you should experience it. Britain's Pink Floyd formed in 1965 and by the '70s they were giving the world masterpiece albums like ""The Dark Side of the Moon,"" ""Wish You Were Here"" and ""The Wall,"" which sold  23 million units in the US all by itself.  This 1973 photo, taken after founding member Syd Barrett left the band, shows from left to right: keyboardist Rick Wright, singer/guitarist Dave Gilmour, drummer Nick Mason and singer/songwriter/bassist Roger Waters. Overall, Pink Floyd has sold 75 million units nationwide, according to the RIAA."
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