Finally, some official word on what kind of music will be included!!http://ps2.ign.com/articles/557/557665p1.html
Now we should tell you right off the bat, that San Andreas looks to expand on the strong production values of 2002's Vice City by quite a considerable margin. Boasting more than three times as many tracks as Grand Theft Auto III (let me say that again: three times as many tracks as GTA3), San Andreas features 11 fully-functional radio stations with 20 completely different DJs. The song list alone is pretty enormous with more licensed music in it than in any other action videogame in history. Ranging in styles from Rap to Rock, Country to House, and Reggae to Rock, San Andreas should have a little something for everyone -- including the always-popular talk radio programming.
"Additionally, players can expect to hear live weather bulletins, deadly accurate news updates, music blocks, custom track lead-ins and outs, and call-ins from people from all over the state."