"Cluster One", an instrumental, is the opening track on Pink Floyd's 1994 album, The Division Bell.[1][2]

"Cluster One"
Instrumental by Pink Floyd
from the album The Division Bell
PublishedPink Floyd Music (1987) Ltd
Released28 March 1994 (UK)
5 April 1994 (US)
GenreProgressive rock, instrumental rock, ambient
LabelEMI (UK)
Columbia (US)


It is the first Pink Floyd song credited to just Wright/Gilmour since "Mudmen", from the 1972 album Obscured by Clouds.

The piece has never been performed live by the band, although portions of it were included in the sound collage tape played before their 1994 concerts.[citation needed]

Track overtureEdit

The noise which opens the track caused some confusion among fans in 1994, who were unsure, on playing the album for the first time, whether or not their copy was faulty, as the noise lasts for just over 1 minute before any music begins. According to an interview with Andy Jackson, recording engineer for the album, this noise is electromagnetic noise from the solar wind.[3] More precisely, this sound is a very low frequency record of dawn chorus[4] and sferics,[5] radio events respectively due to solar wind interference with Earth's magnetosphere, and lightning strikes radio emissions interfering with Ionosphere; this sound has been mistaken for Earth's crust shifting and cracking.[6]



  1. ^ Strong, Martin C. (2004). The Great Rock Discography (7th ed.). Edinburgh: Canongate Books. p. 1178. ISBN 1-84195-551-5.
  2. ^ Mabbett, Andy (1995). The Complete Guide to the Music of Pink Floyd. London: Omnibus Press. ISBN 0-7119-4301-X.
  3. ^ "Andy Jackson | Interviews | Pink Floyd | Floydian Slip™ | Syndicated Pink Floyd radio show".
  4. ^ "VideoFromSpace - YouTube".
  5. ^ "Archived copy". Archived from the original on 2014-09-10. Retrieved 2014-09-10.{{cite web}}: CS1 maint: archived copy as title (link)
  6. ^ McCulley, Jerry (c. 1994), Division Bell review, Amazon.com – via audio-music.info