The studio recording on "The Piper at the Gates of Dawn" is the one that most listeners are familiar with, yet several other versions survive from both the recording studio and the stage. It was first recorded as a demo on 31 October 1966, recorded live-in-studio at Thompson Private Recording Company. This version was used as the audio sound to the film "San Francisco", which was made by a friend of Barrett's, Anthony Stern. While filmmaker Peter Whitehead and his secondhand Stern were having a discussion, the topic about Pink Floyd was brought about by Stern, to which Whitehead told him, "yeah, terrible music". Stern said that "they're successful now", and suggest the pair go watch Pink Floyd, at their gig at the Royal College of Art. Whitehead recalled that they "went to UFO and I liked them. Not connected to pop music, a long improvisatory quality, ideal for what I wanted." Whitehead convinced Pink Floyd to record "Interstellar Overdrive" for a film he was working on. Before turning up at the recording studio, the band held a rehearsal, and the next day, 11 January 1967, went to Sound Techniques studios. The studio, which was originally a dairy factory, was run by engineers Geoff Frost and John Wood.