 Billy Boyd (I) (qv)s 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.