Sad to hear about the passing of Walter Cronkite. He was one of the good ones. I can't say his rendition of Spaceship Earth was any better than a walking audio tour in a museum, but he had a voice that just exuded class. SSE really has gone downhill since.
I posted the Cronkite audio version below. Enjoy!
The Internet: Cronkite Picture
The Internet: SSE Picture
Mousebits: SSE Ridethrough Audio