I need a song for a film

I need a song for a film. The characters are in maximum security prison. Some are nice guys, some are just psycho. They're all in there because of violence while they were in prison.

It's got to have fairly long stretches with no words (just music or beat or something) so we can use it under dialogue. It's gotta be serious, and it's gotta be gritty. I'm thinking something actually about prison or getting busted or something. Something about how much it sucks to be prison. Not "boo yah, bein' a gangsta rules", but more "damn, i miss my kids and my girl" sorta stuff. Gettin' it?

Bluesy, soulful is good. Cheery bad.

Thanks much.

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