Slowthai leans into a bruising post-punk sound on his new song, “Selfish,” which will appear on his upcoming third album, Ugly, out March 3 via Method Records/Interscope Records.

Though arguably known first-and-foremost as a rapper, the frenetic, anxious rock-leaning style of “Selfish” is something Slowthai has explored on past songs like “Doorman” and “Deal Wiv It” (both of which were collaborations with Mura Masa). In a statement, Slowthai spoke about examining his own selfishness, especially in relation to his ambitions: “I want to be there for them but I’m always striving,...