Echoes is the long closing track on Pink Floyd's 1971 album Meddle, and it opens with this single, echoing piano ping before the band gradually builds into the full song. The isolated note has become a favourite on soundboards and in video edits because it is instantly recognisable to rock fans yet works on its own as a moment of suspense. Creators keep returning to it for intros, reveals and atmospheric transitions, where a familiar classic-rock cue adds weight without overwhelming the scene.