Apollo 10 astronauts orbiting the moon in 1969 said they heard strange music at a time when they had traveled far beyond the ability to receive earthly broadcasts, and they weren’t sure whether or not to alert NASA authorities, newly released recordings of their conversations revealed.

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The music apparently started when the astronauts’ capsule had traveled to the far side of the moon, the Daily Mail reported.

And one commented: “You hear that? That whistling sound? Whooooo!”

Another said, the Daily Mail reported:

The astronaunts – Eugene Cernan, Tom Stafford and John Young – said they heard the music almost the entire hour their capsule was on the dark side of the moon. NASA filed the recording of their conversations until 2008, when it was finally declassified.

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The tape’s now the subject of a Science Channel series show, “NASA’s Unexplained Files.”

A preview of the episode shows Apollo 15 astronaut Al Worden saying, the Daily Mail reported: “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.”

Some of the possible reasons for the music the show explores includes a magnetic field that interfered with the radio – but that scenario is quickly debunked by others who point to the fact the moon doesn’t have a magnetic field.

The third season of the series begins Tuesday.

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