I saw Shut Up and Sing last weekend and totally recommend it. I think what's so interesting is the change in our national gestalt between when Natalie Maines of the Dixie Chicks made her comments on stage in London and today, after the mid term elections.
It's a pretty honest look at how all this affected the families and the fan base emotionally. Personally, I believe the music and politics have been intertwined since the beginning of history. It's impossible to separate them and the artists, who make political statements, in music or in speech, are reflecting some chord they have absorbed in their travels. Here is the trailer for the movie. It's only playing in Annapolis right now.