In fact, the bandwidth of FM is 19kHz: you have L+R between 0-19kHz and L-R between 19 and 38kHz, with a 19kHz pilot tone to tell the tuner that it's getting stereo. This is a BANDWIDTH of 19kHz though, which equates to a 38kHz sample rate - much higher than a 22k sampled MP3, which is 11kHz *bandwidth* (look up Nyquist for this sort of stuff :) ).

Hugo