.357 String Band - Fire and Hail

Smokin' hot bluegrass played by a bunch of punk dudes from Milwaukee. Tons of great jams on here! Seriously, try to listen to a song like "Down on a Bender" without smiling. It's tough.
http://www.mediafire.com/?ywjznnjmjdy

Yonder Mountain String Band - Town by Town

Awesome modern bluegrass. No strained revivalism, no faux-lo-fi, just great playing and killer hooks.
http://www.mediafire.com/?hdj3rqjzaoh