This is the famous trippy music bed used by Clyde Clifford (and his successors) underneath their raps on Beaker Street. It's from the 1970 album "Head" on Buddah Records. The artist was electronic musician Nik Pascal Raicevic, and there is more information on this blog site by Leonard Holyoke:
As has been described elsewhere, the purpose for the bed was to mask the noise from the air circulation fans in the mighty 50,000 watt transmitter, located just a few feet from where Clyde was on mic. The bed was from the track ‘Cannabis Sativa’, which is 17:52 in length. It sounds like Clyde took a few minutes from the middle of the track and perhaps looped it to create the music bed for Beaker Street.
The LP is long out of print; I had made a high-quality dub on reel to reel tape in the 70’s. I digitized the track and ran it thru a pop/click filter so it sounds pretty clean. It’s in Stereo, so put on your headphones and enjoy all synth droning, channel to channel spatial effects and just plain weirdness!