For Nashville I'd suggest looking into SongU http://www.songu.com/
Besides the courses ect., you can pitch songs to their songpluggers, who are working in Nashville and offers you real deals. The coaching at SongU is also terrific, and worth the cost alone, so you get much more than you pay for!

Another site I've come across for Nashville is http://www.yourtunespace.com/index.html . I don't know that from direct experience, though, and would probably consider it a hosting site with a community built around it, but it seems there are some kind of opportunity there to at least get your songs heard in that area.