Kelela on 'Hallucinogen' EP, Writing 'Bangers' That Carole King Could Cover

The singer Kelela seemed to emerge fully formed in 2013 with Cut 4 Me, an artful debut mixtape that emphasized atmosphere over groove: Vocals seeped and curled like smoke around off-kilter, bass-heavy beats. But since then, this rising star has kept a low profile, appearing on songs with Bok Bok, Kindness and…