Following the news that fans can see all three Hobbit movies in a trilogy marathon next month, Warner Bros.' WaterTower Music has released the end credits song for The Hobbit: The Battle of The Five Armies, "The Last Goodbye," along with a new TV spot.

We reported last month that Billy Boyd, who played Peregrin Took in The Lord of the Rings trilogy, is singing "The Last Goodbye," which he also co-wrote with filmmakers Peter Jackson, Fran Walsh and Philippa Boyens. Here's what the filmmakers had to say in a statement about the song from last month.

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"It is hard, after 16 years and six films, to know exactly how to say goodbye. We knew that we wanted to speak directly to all those who have taken this journey with us, especially to the fans whose love of these films has so often kept us going. This is why we asked Billy Boyd, who has been with us from the very beginning, and whose portrayal as Peregrin Took in The Lord of the Rings films is so beloved, to help write and perform the final song in this trilogy. Billy is not just a wonderful actor but also an extremely accomplished singer/songwriter-we are so glad he agreed once again to share his talent with us."

In addition to the song, which you can check out in the video player below, we also have a new TV spot for this final Middle Earth adventure, arriving in theaters December 17.