Sonar Kollektiv turns their sights squarely on crossover R&B with this debut from Platnum. Focused on vocalist Ruth Maria Renner, who not only sings but programs beats and produces (with help from DJ Illvibe and Monk), Rock Me is somewhat hit or miss. But when it works, like on the bass rumbling and music box tinkling “Sweet City,” the slow-burn grind of “Greatest,” or the boogie romp of “She Won‘t Do It,” Platnum is as good as gold.