Fortunately, the radio technicians (rather than the UFO fans) had a ready explanation for it: it was interference between the LM’s and Command Module’s VHF radios
There was nobody in the LEM at the time, right? So why would its radio be turned on? And why would it interfere with the main radio? Even if there were two different manufacturers, wouldn’t they be working from pretty much the same spec? That’s obviously not music, but I’m not buying the “ready explanation” either.