Audio quality degradation over FM transmission

I would like to know why a CDDA/MP3 FM radio transmission at 88-108 MHz
results in degradation of sound quality. As I understand it, standard
CDDA/MP3 audio is sampled at 44.1 KHz. 88-108 MHz is well above this
threshold, and I don't see how the transmitted audio "data" can't
travel along this invisible pipe at an adequate enough speed to result
in perfect end-to-end transmission (assuming no interference/loss). I
have heard that USA public FM radio transmissions could be compared to
64 Kbps MP3 audio. I guess that I am just interested in the physics of
how this works, so don't be afraid to hit me with some math :-)

Kristian Hermansen

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