Speaking of Oxford American, BTW, their next issue will be the music issue. Pick a good newsstand or bookstore, and keep an eye out. The OxAm music issue is the best single issue of any magazine for music geeks all year long.
For a slightly more commercial take on tunes (and movies as well) there's also the British mag Uncut. You might find it in a bookstore or newsstand with a deep selection, and at $8.95 it ain't cheap. But you do get a mix CD each month, and the March 2003 one was full of very good Bowie covers, including "All the Young Dudes" by Alejandro Escovedo, and "Heroes" by Blondie (circa 1980!).
The Price of Oil - Billy Bragg
(props to Goddess for the tip!) Everyone's favorite British socialist speaks truth to power.
Self Evident - Ani Difranco
This one actually came out soon after 9/11, underscoring Ani's status as a fearless and uncompromising righteous babe.
Ready for more? The Peace Not War Compilation website should keep you busy for a good while.