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To many rock fans of advancing years, the name Ron Geesin may be vaguely familiar for but one reason.

Anyone who has ever closely scrutinized the credits of Pink Floyd's Atom Heart Mother might have at least been momentarily perplexed to discover that the side-long title track is the work of Gilmour-Waters-Wright-Mason and Geesin -- the only instance of a Floyd track being even partially composed by anyone other than a member of the band, (at least before David Gilmour started roping in outside lyricists after Roger Waters' departure).