"The People United Will Never be Defeated," Ursula Oppens, pianist; Frederic Rzewski, composer.
Frederic Rzewski, Wikipedia.
"Blood Money" by Brandon Carter.
Lyrics at OccupyWallStreetMusic.com.
"Finally Here" by The Roaring featuring Ari Herstand.
Lyrics at The Roaring.
"Hope, Struggle and Change" by Roy Zimmerman.
Roy Zimmerman: RoyZimmerman's Channel - YouTube; RoyZimmerman.com.
Amy Goodman and Juan Gonzales, "Legendary Folk Duo Crosby & Nash on Soundtracking Movements from the 1960s to Occupy Wall Street," Democracy Now!, 10 November 2011.
Occupy Music: Sounds of the 99%.
The cover art is from "Faces of Occupied Wall Street #1" by Molly Crabapple.
A compilation album by a range of musicians. Released 15 October 2011. Much better than you might expect!
Protest Music, Daily Kos.
A Daily Kos group; lots of diaries under this heading.
Occupy Music, a Facebook Community.