Harlem born and bred, rapper Crystal Caines got her start as a producer. First working with A$AP Ferg, Caines -- who also lists engineering, mixing, and singing on her résumé -- produced "A Hundred Million Roses," her first song with the rapper, and went on to put her mark on "Lord," the Bone Thugs-N-Harmony collaboration on Ferg's 2013 debut, Trap Lord. With a tough and direct delivery, Caines made the move to the mike in 2014 on her debut single, "Whiteline," which featured a verse from Ferg. Continuing their studio chemistry, Caines produced and rapped on a handful of songs...