On April 2nd, 1975 Tangerine Dream performed in London again. The gig was introduced by John Peel and provided quadrophonic sound. Likewise to the Australia tour earlier the same year Peter Baumann was replaced by Michael Hoenig on stage. Peter Baumann was backstage during the entire concert, but never appeared on stage.
Most of the concert was recorded by BBC to be (partly) broadcast on April 14th, 1975. Interviewed by programme presenter Mike Sparrow a certain Steve Harvey (apparently a BBC employee) told about the recording: "[...] I've always been a fan of Tangerine Dream and the chance to actually record it was something quite astounding. I rang up Virgin Records and said 'Look, how about recording this Royal Albert Hall gig?' And to my amazement they said 'Yes'. Tangerine Dream because they are a band I think you have to listen to at home, preferably in a darkened room with a nice quiet atmosphere around you, with very little distraction and I think they're the perfect band to listen to... particularly if you've got a VHF receiver and can get a good, high quality reception. [...] We've got a stereo recording, but unfortunately we go out in mono. But all the same, I think it should be a very nice concert indeed. [...][The recording] was done by the Broadcasting House O.B. [that is, Outside Broadcast] engineers who normally work on Radio 3 and I think they were quite surprised in fact to work on a concert of this nature. They were a little dubious at first, but I'm glad to say that when they actually got down there and heard some of the music, they got very much into the spirit of things. [...]"