MB,The proposition that "[t]here has to be some kind of enforceable regulatory legislation designed to level the playing field" is just a terrible idea. Some government agency is going to require radio stations to play the Dixie Chicks? More likely, that power, if granted, would ultimately be used to require the dissemination of pro-, not anti-, administration messages. Foolish.
Mercifully, we got rid of the FCC "fairness doctrine" in the 1980s (thank you, Pres. Reagan). There are so many outlets for ideas and messages that there's no reason for government censorship on the "fairness doctrine" model. If radio stations won't play their songs, then they can go to cable tv, or the internet (start a blog and post a sample audio or video there, or post a video on You Tube), etc., etc., etc. Hell, they can go sing on a streetcorner.
In this regard, the title of this thread, "Dixie Chicks Censored", is exactly wrong. It's the remedy that is being proposed that would constitute censorship.