In the video `` Classic Albums : Pink Floyd -- The Making of The Dark Side of the Moon '' , engineer Alan Parsons described the recording of the band 's initial backing track for the song : They used the sound-effect tape loop as a sort of metronome , but Parsons gradually faded out the loop before the vocals started .
In the video `` Classic Albums : Pink Floyd -- The Making of The Dark Side of the Moon '' , engineer Alan Parsons talked about the recording of the band 's first backing track for the song : They used the sound-effect tape loop as a sort of metronome , but Parsons gradually faded out the loop before the vocals started .