Mumford And Sons and Elvis Costello covered Bruce Springsteen's The Ghost of Tom Joad for The One Campaign.

The song is the title track from Bruce Springsteen's 11th studio album.  The name comes from John Steinback's The Grapes of Wrath.

The One Campaign was started by U2 front-man Bono.  The organization seeks to end extreme poverty.

Other notable artists have covered the song including Rage Against The Machine.  Springsteen does a pretty great version of the song with Rage Against The Machine guitarist Tom Morello.  Watch that after the Mumford/Costello version.