NASA is going to release the tapes to this mission coming up, pretty cool story if you haven't heard about it before,

Apollo astronauts who orbited the moon two months before Neil Armstrong's famous 1969 landing heard mysterious and unexplainable 'music' on its far side, out of the range of Earthly radio transmissions, it has emerged.
Recently unearthed recordings made by NASA of the journey, which took the Apollo 10 capsule around the far side of the moon, show the astronauts reacting with surprise and confusion to an unearthly howling noise in their headsets.
The sound began once the capsule was on an hour-long trip around the far side of the moon, out of the range of any Earth broadcast. At one point the baffled astronauts can be heard discussing whether they should tell NASA command or not.


Read more: [link to www.dailymail.co.uk]