Sounds like EMI. Magnetic reconnection or something like that perhaps, or even an interstellar source?
Nope, gotta be alien music. Make it all spooky and dramatized. Is even The Science Channel entirely like that, the same thing that infected Discovery Channel long ago?
I'm sure it would have been creepy at the time though, sort of like discovering pulsars was. "LGM" - little green men, was an acronym associated with pulsars briefly, partly in jest. They were hitting us with extremely precisely-spaced pulses of radio waves. Nothing natural had been seen that would do that, until it was determined that they were just rapidly spinning magnetic neutron stars.