NASA to reveal unexpained 'music' from far side of the moon

After 40 years, secret recordings from an Apollo mission will be revealed on the Science Channel's series, NASA's Unexplained Files.

Before the historic Apollo 11 landing on the moon, three astronauts in 1969 were baffled when they encountered strange sounds, while they were out of the range of radio broadcasts from Earth. The Apollo 10 mission included spending an hour crossing the far side of the moon, which blocked all contact with NASA's mission control.

When Commander Thomas P Stafford, Command Module Pilot John W Young and Lunar Module Pilot Eugene A Cernan heard the sound, described as "whistling" in declassified mission transcripts, they were unsure whether to report it.
  
Mission transcripts reveal the men talking about the noises, although it is unclear which one of them is speaking. This is some of what is in the transcripts:

"You hear that? That whistling sound? Whooooooooo!"
 
"It sounds like, you know, outer space-type music."

"I tell you, that music is really weird."

"No one will believe us."

From a clip of the show, Apollo 15 astronaut Al Worden said, "The Apollo 10 crew was very used to the kind of noise that they should be hearing. Logic tells me that if there was something recorded on there, then there was something there."

Several NASA probes have recorded "sounds" from space before, which are electromagnetic waves that pulse through the vacuum of space. Listen to NASA's sounds of space: