Watch: Sam Smith & Disclosure Team Up for 'Omen'

"It was really exciting," Disclosure's Howard Lawrence said in a statement. "We had three whole days to hang out with Sam and write, which are two of my favorite things to do."

The last time Smith teamed up with Disclosure, they released "Latch," which became a breakout hit in the U.S. for the duo.

"It just would have felt wrong to not have [Smith] on the record," Lawrence told EW earlier this year. "We speak to Sam everyday. He's our best mate. And he's the best singer in the world. Why would we not put him on the record?"