Trio S.B.E. (Yung Stakks, Donnie Dee, and Yung Nell) is kind of like the Travis Porter of Chicago's bop scene, an approachable but cool-guy boy band making hook-driven party music. Their latest, "I Flex," is a perfect bop track, produced by Cicero On Da Beat, who's also responsible for some of Breezy Montana's best tracks. S.B.E. have been around since 2010; hopefully, after a momentum-building collaboration with Jeremih, 2014 will be their best year yet.