Howard focused on Dent and Zimmer focused on Batman and the Joker. Zimmer did not consider Batman to be strictly noble and wrote the theme to not seem "super". Howard wrote about ten minutes of music for Dent, wanting to portray him as an American who represents hope, but undergoes an emotional extreme and moral corruption. He used brass instruments for both moral ends but warped the sound as Dent is corrupted. Zimmer wanted to use a single note for the Joker's theme; he said, "imagine one note that starts off slightly agitated and then goes to serious aggravation and finally rips your head off at the end". He could not make it work, however, and used two notes with alternating tempos and a "punk" influence. The theme was influenced by electronic music innovators Kraftwerk and Zimmer's work with rock band The Damned. He wanted to convey elements of the Joker's corrosion, recklessness, and "otherworldliness" by combining electronic and orchestral music, and modifying almost every note after recording to emulate sounds including thunder and razors. He attempted to develop original sounds with synthesizers, trying to create an "offputting" result by instructing musicians to start with a single note and gradually shift to the second over a three-minute period; the musicians found this difficult because it was the opposite of their training. It took several months to achieve Zimmer's desired result. Following Ledger's death, Zimmer considered discarding the theme for a more traditional one but he and Howard believed they should honor Ledger's performance. Release Marketing and anti-piracy The Dark Knights marketing campaign was developed by alternate reality game (ARG) development company 42 Entertainment. Christopher wanted the team to focus on countering the negative reaction to Ledger's casting and controlling the revelation of the Joker's appearance. Influenced by the script and the comic books The Killing Joke, The Long Halloween, and Arkham Asylum: A Serious House on Serious Earth (1989), 42 Entertainment paced the ARG over annual events, although Warner Bros. rejected their ideas to use Jokerized Santas at Christmas, coffins filled with chattering teeth on Mother's Day (mocking Wayne's late mother), and Batman actors on rooftops due to safety concerns. The ARG began in May 2007 with campaign posters for Dent and Joker playing cards bearing the phrase "I believe in Harvey Dent" were hidden inside comic books at stores around the U.S. This led people to a website where