BROCKHAMPTON call themselves a boy band, but take that with a grain of salt: With “HEAT”, the L.A. rap collective’s first album of 2017 opens with a grinding beat and the ominous admission, “I hate the way I think/I hate the way it looms.” It’s not all so aggro: “GOLD” is a breezy ode to self-love over a golden hook, while the spacious, springy “BOYS” lets the crew’s rappers show off their range of flows—playful, slinky, menacing and above all, seductive.