This song was first featured on the San Francisco Soundtrack and also in different form on the 'Tonite Lets All Make Love in London' movie.
"I was once trying to tell him about this Arthur Lee song I couldn't remember the title of, so I just hummed the main riff. Syd picked up his guitar and followed what I was humming chord-wise. The chord pattern he worked out he went on to use as the main riff for…
InstrumentalPink Floyd - Interstellar Overdrive Lyrics