"The sophomore full-length album from Melanie Martinez, 2019's K-12, finds the arty pop singer offering yet more darkly emotive anthems centered on adolescence and growing up ... K-12 features songtitles inspired by school-age themes including "Show & Tell," "Nurse's Office," and "Wheels on the Bus," albeit with many of the tracks working as metaphors for more turbulent adult issues ... Musically speaking, K-12 has the same hip-hop and R&B underpinnings that Martinez favored on Cry Baby ... showcasing her detached, periodically down-pitched babydoll vocals and a penchant for what sounds like midtempo xylophone and African finger-piano grooves. That said, it's also a more sophisticated production, with better hooks showcasing Martinez's growth as a songwriter. It's a sound that ably straddles the line between Lana Del Rey's disaffected noir style and Mike Posner's more confessional pop".