A Night on the Keck at Mauna Kea (sung to "Hotel California") - very nice, very fun!
Getting Lucky at the Cassegrain Focus
Geoff's Narrative of a Night at the UKIRT telescope on Mauna Kea - good for future astronomers to watch
The Biggest Optical Observatory in the World - nice sound track to the newest and biggest of 'em all
Max Tegmark etal's Beatle's Rap on Relativity
Brian Green: "The Elegant Universe" - Relativity