WaterTower Music will release of the soundtrack to The Hobbit: The Battle Of The Five Armies, with music composed by Academy Award® winner Howard Shore and an original song performed by Billy Boyd, who starred as Peregrin Took in The Lord Of The Rings Trilogy, on December 9th. The soundtrack will be released in two configurations: a standard 2 CD set and a Special Edition set, also with 2 CDs, and featuring extended tracks, bonus tracks, and expanded liner notes, which will be available on December 16.
You can preview the tracks here and purchase them on iTunes or on Amazon.