The Lord of the Rings: The Return of the King (2003)

Billy Boyd's (Pippin) singing scene largely came about because Philippa Boyens went for a night out at a karaoke bar with the younger male cast members and she was very struck by the quality of his voice. Remembering that Denethor asks Pippin to sing him a song when Faramir heads off to war, she resurrected the lyrics from the novel and Boyd himself came up with the tune for it.