Released in 1969, Ummagumma represents where the influence of departed founding songwriter Syd Barrett began to fade in favor of the rather less whimsical and pastoral visions of Roger Waters. Ummagumma is a double album, divided into live and studio halves. The live cuts--"Astronomy Domine," "Careful with That Axe, Eugene," "Set the Controls for the Heart of the Sun," and "A Saucerful of Secrets"--established the Floyd's predilection for gloomily atmospheric and faintly preposterous sci-fi bombast that would turn them into such a successful stage act. The kindest that may be said of the studio compositions--by and large interminable avant-prog rambles in search of the lost chord--is that they haven't dated terribly well. --Andrew Mueller