When Chris Cornell took on the immense task of writing a song for the movie The Promise, a film whose story touches on the Armenian genocide, he did a lot of research.

"There are a couple of really amazing documentaries about the Armenian genocide, and one of them was about the phenomenon that people who had literally minutes to grab what they could from their homes would take photos before anything else – before jewelry even," he tells Rolling Stone. "I was really moved by that; the idea of what is most important to people in a crucial second."