could be ... equipment malfunction through power irregularities, reception problems interfence from other stations, FM waves bouncing where they shouldn't (have you ever moved closer/further from a weak FM signal and noticed how the signal and thus the sound changed), intentional recording techniques, room interactions ....
If you can remember the exact time you heard the song, then phone the radio station to get the name of the CD and go out and buy a copy of the music. This is the best suggestion I can make, because judging by your shock/amazement, you probably won't sleep a wink until you know the truth!
If you can remember the exact time you heard the song, then phone the radio station to get the name of the CD and go out and buy a copy of the music. This is the best suggestion I can make, because judging by your shock/amazement, you probably won't sleep a wink until you know the truth!