The Passing Bells the conclusion of the war. The series was announced by the BBC in October 2013, along with other programmes that played a part in the BBC World War I centenary season. It was a Red Planet Production with BBC Worldwide as the distributor. Filming took place in Poland. Telewizja Polska and Apple Film Production were co-producers. The series aired in the pre-watershed time-slot of 7pm, and the script was written for a younger audience and family viewing. The title was taken from the first line of Wilfred Owen's 1917 poem, "Anthem for Doomed Youth": "What passing-bells for these who die
The Bells of Notre Dame and that was the catalyst for the song's creation. "Disney Voice Actors: A Biographical Dictionary" explains that "the opening sequence of [the film] was originally all narration and the result was deemed too lifeless so ['The Bells of Notre Dame'] was written". Alan Menken said "It's a really rich number and I think it's possibly the best opening number I've ever written for any project". With the DVD release, a multilingual version of Bells of Notre Dame made of all the 31 original dubs was included in the bonus material. Since its first release, more dubs have been made, including