Taken from GreenDayMusic.com:
"Green Day will contribute a cover of John Lennon's "Working Class Hero" to the forthcoming CD Instant Karma: The Campaign To Save Darfur, proceeds from which help support Amnesty International's campaign to focus attention on the urgent catastrophe in Darfur, Sudan. "Working Class Hero," which appears on Lennon's 1970 album John Lennon/Plastic Ono Band, is considered one of the former Beatle's most overtly political songs, with its themes of class and social alienation. Green Day - singer-guitarist Billie Joe Armstrong, bassist Mike Dirnt, and drummer Tré Cool - will also shoot an accompanying video for the track."1
The track was added to Q101 in Chicago's playlist on April 30, 2007 and added to iTunes on May 01, 2007.
Video
The video was added to playlists on iTunes, MTV, MTV2, mtvU, mtv.com, mtvu.com and the Idiot Club on May 31, 2007.