Silk Sonic, the collab project of Anderson. Paak and Bruno Mars, have dropped off their debut single “Leave the Door Open.”

Clocking in at approximately four minutes, “Leave the Door Open” hears the duo’s approach on smooth ’70s soul. Mars and. Paak spoke to Apple Music’s Zane Lowe and revealed that the Silk Sonic project essentially began from a studio session in 2017. “It snowballed. And it was like, well, want to come back tomorrow? And we kept coming up with music. It felt like why you fall in love with music in the first place. And jamming with your buddy… There’s no plan, just working out the parts and trying to excite each other,” Mars said.