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The soundtrack includes "Avenue of Hope", a song released by I Am Kloot a year before its inclusion in the film, and "Peggy Sussed" by Underworld. These tracks are featured during the film's end credits.
The soundtrack release was held up for over a year with lawyers trying to resolve unspecified legal issues. However, on 10 September 2008, Underworld announced that the soundtrack was to be released in digital format shortly. On 25 November 2008 the soundtrack was finally released exclusively through the iTunes Store. On 14 February 2009 the album was re-released on iTunes in DRM-free iTunes Plus format. A remastered version of "Adagio in D Minor" was released by John Murphy in 2012. Although available for purchase via iTunes, Murphy announced that anyone signing up to his site's newsletter would receive a free Mp3 copy, along with a copy of the remastered "In the House - In a Heartbeat".
The most common tracks adapted for other media are "Sunshine (Adagio in D Minor)", and "Kaneda's Death Pt. 2 (Adagio in D Minor)". Variations of the adagio's progression appear in many films, television programs, trailers, and adverts. Notably, John Murphy heavily re-used the adagio as a theme during composition of the Kick-Ass soundtrack, and wrote a series of variations for use in the film. Other examples include:
A trailer for the movie The Big Picture, original title 'L'homme qui voulait vivre sa vie'
The opening segment on HBO's 24/7 Rangers vs. Flyers series that debuted in December 2011.
"View from the ISS at Night" - A Timelapse video of the Earth compiled by Knate Myers from still photos taken from the International Space Station and archived at the Image Science & Analysis Laboratory at NASA.