Pink Floyd - Echoes

"Echoes" is a song by Pink Floyd, including lengthy instrumental passages, sound effects, and musical improvisation. Written by all four members of the group (Roger Waters, Richard Wright, David Gilmour, and Nick Mason), "Echoes" provides the extended finale to Pink Floyd's album Meddle. The track has a running time of 23:31 and takes up the entire second side of the vinyl recording. It is widely considered one of Pink Floyd's most ambitious and musically diverse compositions.

It also appears in shortened form as the fifth track on the compilation album which took its name, Echoes: The Best of Pink Floyd. "Echoes" is the third-longest song in Pink Floyd's catalogue, after "Atom Heart Mother" (23:44) and the combined segments of "Shine On You Crazy Diamond" (26:01). Unlike those pieces, it is not explicitly divided into separate parts; however, the composition was originally assembled from separate fragments, and was later split in two parts to serve as both the opening and closing numbers in the band's film Live at Pompeii.