from wikipedia, re the soundtrack:
Quote:
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The nine-minute suite for the Joker ("Why So Serious") was based around two notes played by Electric cello, solo violin, guitars and a string section. Zimmer compared its style to the band Kraftwerk, who come from his native Germany, as well as his work with bands like The Damned.[4] throughout the piece, Zimmer used razor blades on string instruments to achieve the tortured, twisted sound to accompany the character onscreen. When Ledger died, Zimmer stated that he felt like scrapping his original material and composing a new theme, but decided that to do so would compromise the "evil [performance] projects".[5] James Newton Howard composed the "elegant and beautiful" themes for Harvey Dent/Two Face, to work as a aural contrast.
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the bit playing in that scene is part of "why so serious"