As mentioned earlier, the 32 stereo music channels (Actually 31 music channels and Latter Day Saints Radio Network...now called Brigham Young University Radio) come as part of America's Top 100CD (Called A.T.120CD as of 2/1/04) $34.99/mo or $39.99/mo with locals.
However if you want to save a buck or two and really don't want all the video channels, you can get the 32 music channels a la carte WITH AT50 (called AT60 2/1/04...$24.99/mo or $29.99/mo with locals) for $4.99/mo. I'm fairly certain that the music channels are not available without some sort of video subscription. You will also have to play CSR roulette since this is an obscure a la carte offering.
And as metioned earlier, the 20 additional monaural audio channels are only available with AT150 and up.
See ya
Tony