Bruno Mars pours his heart out on the new track “It Will Rain,” the lead single from the soundtrack to The Twilight Saga: Breaking Dawn – Part 1, in stores November 8.

“The Twilight movies for me [are] a love story. But it’s a dark love story,” Bruno tells Billboard. “And I think the best way to describe the song is: it’s the darker side of love. I think that pretty much sums it up.”