The basic idea was first developed by David Gilmour, but improved with a different note sequence by Roger Waters, earning both a writing credit.
[8] This piece was created by entering an 8-note sequence into a Synthi AKS synthesiser made by the British synthesiser manufacturer EMS and speeding it up, with an added white noise into A channel on the Ring Modulator, and the Sequencer trigger pulse into Channel B of the Ring Modulator thus creating the hi-hat sound.
The band then added backwards guitar parts, created by dragging a microphone stand down the fretboard, reversing the tape, and panning left to right.
When The Dark Side of the Moon was performed in 1972 (before the album was released), it went under the title "The Travel Sequence" and was a more simple guitar jam, without synthesisers and other electronic instruments.
(A studio version of the original arrangement was finally released on the Immersion box set of Dark Side of the Moon in 2011, alongside a live performance from Brighton 1972.)
"[11] During the first official performance of Dark Side of the Moon, at the Rainbow Theatre on 17 February 1972, a version of this song was played with guitar, keyboard and drums instead of the synthesizer track that appeared on the album.
During their 1970s "Musicradio" era, Chicago radio station WLS-AM 890 used part of the song as background music for recorded prize and contest phone calls that were played on-air.