Dark and hypnotic street rap from three of its finest purveyors

21 Savage, Migos' Offset, and Metro Boomin have all worked tirelessly, if only occasionally together, to become some of hip-hop’s most in-demand collaborators. Without Warning, an album whose release lives up to its name, is a return to the MCs’ trap-music roots (after having achieved a fair bit of pop appeal). The whole of it is dark and dense with highlights like the admonitory “My Choppa Hates N*ggas” and “Run Up the Racks,” a song whose muffled keyboard chimes cast an eerie pall over brags of ill-gotten income. The woozy Offset solo outing, “Ric Flair Drip,” is one of the few more jubilant moments.