A brief word of advice to all Tolkien enthusiasts, LotR-lovers, Elf friends, Hobbit fans, Middle-earth-maniacs, etc., etc.:
purchase this song and bask in its beauty.
Then go see The Battle of the Five Armies at a theater near you so that you may be fully immersed in its magnificence.
Then wait six months for my extended thoughts on the song. :)
The Last Goodbye is melodically reminiscent of Into the West from the end of The Return of the King - definitely a point in its favor! This song is performed beautifully by Billy Boyd, and is a fully fitting finish to the Hobbit trilogy.