NASA: Since the Internet did not exist in the Apollo era, we have only recently provided digital files for some of those earlier missions. via nasa tumblr
'The Apollo 10 audio clips were uploaded in 2012, but the mission’s audio recordings have been available at the National Archives since the early 1970s.
'As for the likely source of the sounds, Apollo 10 Lunar Module Pilot Gene Cernan told us on Monday, ‘I don’t remember that incident exciting me enough to take it seriously. It was probably just radio interference. Had we thought it was something other than that we would have briefed everyone after the flight. We never gave it another thought.’
'Recent news articles have reported that “newly declassified” audiotapes reveal that Apollo 10 astronauts heard “outer-spacey” music as the spacecraft flew around the far side of the moon in 1969.'
Listen to the audio file, it is available HERE (starting at 2:50).
Full transcript is available HERE.