... via BoingBoing:
"Moonhead" by Pink Floyd (live in studio, 1969)
Per the YouTube poster:
A instrumental piece used for a tv-programme on the evening of the first moonlanding July 20, 1969. The programme was a used by the BBC in between the coverage of the actual moonlanding -and was called 'But what if it's made of green cheese'. The theme was the first verse and the coda, with various actors reading quotes and poetry about the moon over. The rest of the programme was information, discussions and sketches. Later in the show, Moonhead was performed uninterrupted.
Other quotes & links at the BoingBoing post!