Chart-topping rap collective D12 and U.K. cartoon band Gorillaz have announced more details for their musical collaboration, dubbed "911." According to a statement, the song will be available for free

Chart-topping rap collective D12 and U.K. cartoon band Gorillaz have announced more details for their musical collaboration, dubbed "911." According to a statement, the song will be available for free download on Gorrilaz' official Web site starting Dec. 7. Earlier this month, the cut, inspired by the Sept. 11 terrorist attacks, was placed on the site as a stream.

The Eastern-flavored song was recorded in London in the days following the attacks, when D12, minus ringleader Eminem, was unable to return to the U.S. due the grounding of American airliners. Terry Hall, former lead singer of ska group the Specials, guests on the track, of which he says, "When I first heard what D12 did I was amazed, such unedited emotion. The track is all about opening your heart and your mind." The singer first met Gorillaz co-creator Damon Albarn (Blur) when the two collaborated on an U.K. single in 1995.

The track is said to have been inspired by the "extreme violence" of the attacks, and a new video will be placed on Gorillaz' Web site, along with downloadable artwork. Gorillaz were conceived by Albarn and "Tank Girl" illustrator Jamie Hewlett as a Web-driven concept, built around the virtual identities of frequent collaborators Dan the Automator, Ciba Matto's Miho Hatori, and Del the Funkee Homosapien. On working with the group, D12's Swifty says in the release, "We chose some beats, we went on a vibe, a nice vibe. We enjoyed working with them, they have a nice flava."

Gorillaz attained worldwide success with the hit single "Clint Eastwood," fueled by a cleverly drawn video that pays homage to Michael Jackson's "Thriller." The cut peaked at No. 57 on The Billboard Hot 100 in late September, while the group's self-titled Virgin debut has now sold more than 1 million units in the U.S. to date, according to SoundScan.