Evolved from a radio show and live showcases, New Gen is a relentlessly absorbing album of original material from Britain’s emerging hip-hop, R&B, and grime talent. “F**k Your Feelings” embodies the collection’s vitality and invention, swaggering and staggering to volatile, minimalist beats while Kojey Radical’s vocal darts from ragged raps to honeyed crooning. Elsewhere, 67’s simmering trap music (“Jackets”) and Ray Blk’s effortlessly melodic R&B (“Busy”) portray a scene in rude health.