It was a brilliant musical choice that offset the ghastly violence, so of course it was inspired by Justin Bieber. Yeah, that bratty Canadian pop star we all try really hard to ignore (news of his shitty escapades is as persistent as an itchy butthole) is indirectly responsible for some of the best shootout scenes in recent memory.
Dredd's composer, Paul Leonard-Morgan, showed an early cut of the movie to his friend and massive Judge Dredd fan Geoff Barrow, an original member of the trip-hop band Portishead. The Slo-Mo scenes reminded Barrow of a cool thing he had seen on the Internet where someone slowed down a Justin Bieber song by 800 percent and the result was an entirely different song that felt ethereal, otherworldly, and much more dramatic. Beautiful, even. Did I mention it was a goddamn Justin Bieber song? Because it was. It was a goddamn Justin Bieber song.
Leonard-Morgan used the track above as the temp track for Slo-Mo scenes on an early cut of the film, then made his own version of it for the final score by recording a track and slowing it down.