The award is to the Artist(s) and/or Producer(s) of a majority of the tracks on the album, or to the individual(s) actively responsible for the concept and musical direction and for the selection of artists, songs and producers, as applicable.
Mamma Mia! will be up against American Gangster, August Rush, Juno and Sweeney Todd — The Demon Barber Of Fleet Street.
The 51st Grammy awards take place on 08 February 2009 at the Staples centre in Los Angeles.
UPDATE 09 Feb 2009: The award went to the soundtrack for Juno.