Pink Floyd - the happiest days of our lives, 1979

"The song is approximately one minute, 46 seconds in length, beginning with 24 seconds of a helicopter sound effect, followed by the schoolmaster shouting, "You! Yes, you! Stand still, laddie!" performed by Roger Waters. Waters's lead vocal is treated with a reverse echo. The song features an electric guitar with an added delay effect and an electric bass guitar playing staccato punctuations of the chordal root notes."