OneRepublic and Katy Perry are among the musicians who’ve provided music for use in a new short film marking World AIDS Day, which is today, December 1. The video was created to honor the work done by the Elizabeth Taylor AIDS Foundation, established by the late actress to fight HIV/AIDS during a time when the cause was anything but popular. It features narration by Colin Farrell , and reminds people that the fight against the disease is far from over: there are 35 million people currently living with it.