Hans Zimmer, who composed the music for the movie The Dark Knight Rises, has written a song dedicated to the victims of the Aurora, Colorado, massacre at a midnight showing of the film.

Zimmer recorded the eight-and-a-half-minute song in London in the days after the July 20th shooting, and has posted it on his Facebook page. It's being sold for donations from 10 cents to $2,500, with all proceeds going to a fund for the Aurora victims.