Director Guy Ritchie used the soundtrack from the film The Dark Knight by Hans Zimmer as temporary music during editing.

Zimmer was pleased when Ritchie asked him to do the score but was told to do something completely different[citation needed].

Zimmer described his score to Ritchie as the sound of The Pogues joining a Romanian orchestra.

[1] For the musical accompaniment, composer Hans Zimmer used a banjo, cimbalom, squeaky violins, a "broken pub piano" and other unconventional instruments such as the Experibass.

Zimmer said "We rented 20th Century Fox’s underground car park one Sunday and did hideous things to a piano.