Kennedi Lykken was still a teenager when she put out her solo debut, in 2016; by the time she was 21, she’d graduated to writing for Ariana Grande, the Jonas Brothers, Dua Lipa, and David Guetta. Whatever the genre, Kennedi specializes in bruised hearts and bull-headed determination; her songs are vulnerable, wry, and extremely relatable, and her perfect turns of phrase are the barbs that keep her hooks lodged deep.