Well, this is unexpected. Leona Lewis’ new single from the upcoming Glassheart album is out, and it features none other than Childish Gambino. Leona is most famous for “Bleeding Love,” and “Trouble” follows in the same footsteps with a big beat, catchy hook, and dramatic, well-polished feel. It’s not the kind of song that necessarily calls for a guest rap verse, but it also doesn’t sound out of place. Check it out below, and pre-order the track on iTunes.