Endorsed by Kanye West, the New Jersey artist’s breakout single is a textbook course in blending rap with contemporary R&B. A glittering piece of robo-soul worthy of artists like Future or Rich Homie Quan, “Trap Queen” has the kind of casual, tossed-off hook that seems to arrive from nowhere and burrow its way to the back of your head. It's a propulsive, immediate song and an auspicious start.