Snoop Dogg and 3D of Massive Attack recorded a song together entitled Calling Mumia.
The song is now available for listening on the Massive Attack Website.
Calling Mumia is set to appear on the soundtrack to the documentary film, In Prison My Whole Life, which follows the life of Mumia Abu-Jamal, a political activist.
Abu-Jamal was sent to a United States prison and was charged with the murder of a police officer. His death sentence was overturned in 2001 due to inconsistencies during his trial.