Hot off the success of their online hits “Versace” and “Hannah Montana,” Migos use No Label II to reaffirm their patent: an inimitable balance of dense half-time beats and rapid double-time raps. A squadron of innovative Atlanta producers creates a stunning backdrop of noises. “Contraband,” “M&M’s,” and “Payola” are quintessential Migos, with rumbling, elastic beats; the raps fly from the songs like sparks from a pinwheel. “Fight Night,” however, provides a new twist on the group’s recipe, as an uptempo, burping bassline coaxes new vivacities from the three longtime partners.