loranskunky pointed out a great YouTube clip about the making of the "Doctor Who" theme. This is the most widely-known version, I think, with all the gorgeous synth effects. The video features Peter Howell who did the new arrangement of the original theme by Ron Grainer (the same guy who did The Prisoner's theme).
Plus you get to see all the lovely synth equipment. Gotta love that Arp Odyssey! And I'd never have guessed that they used a vocoder in the instrumental line.