I talk about them every time a thread like this comes up.
They're two singer/songwriters, playing guitar and accordion, and they write like a cross between Phil Ochs, Tom Lehrer and Stephen Sondheim-- laugh out loud funny, and really intricate rhyme schemes, but with a distinct progressive edge. They just finished recording a full length CD called Total Myshkin Awareness, with 13 songs on it, ranging from an apolitical social satire called "Traffic Jam" to a wonderfully sarcastic reminiscence of the Reagan presidency called "I Don't Remember" to a pointed critique of the BushCo foreign policy called "A War Without an End" to a very somber number, like a fake hymn, called "Ministry of Oil."
They're gay, and I think their partnership is personal as well as professional, and sexual orientation certainly informs their lyrics and their politics. (There's one song called "Freudian Slip," originally inspired by Dick Armey calling a certain Massachusetts legislator "Barney Fag," but it goes on to document the pattern of embarrassing mis-statements by the new ruling class.) They also do things like perform at the School of the Americas demonstration every year (and they have a really clever song about that too). Check them out at
http://www.hiddenagendamusic.com/myshkins. BTW, they took their name from the "hero" of Dostoevsky's novel The Idiot.
I also recommend Emma's Revolution, singer/songwriters Pat Humphries and Sandy Opatow (also a committed partnership). They write simpler, more sloganistic stuff, in the mode of Woody Guthrie or Joe Hill, but they also wrote what is in my opinion the best 9/11 song ever, a tune called "If I Give Your Name," which deals with the concept that many of the casualties were undocumented service workers (janitors, food service, elevator operators, etc.) whose equally undocumented survivors can't even talk about them, and therefore they didn't get counted (or honored) properly. Check them out at
http://www.pathumphries.com.