Diplo has said that Music Is the Weapon is to be his final album with Major Lazer, but time will tell; the Mad Decent kingpin is nothing if not unpredictable. The group’s fourth LP, arriving five years after 2015’s Peace Is the Mission, features American DJ Ape Drums in the place of original member Jillionaire, but the vibes remain quintessentially Major Lazer—a mix of dancehall, soca, EDM, and house, all buttressed with gargantuan drums and burnished to a high-gloss sheen. As always, the group knows its way around an unforgettable pop hook. On “Hell and High Water,” Alessia Cara brings platinum panache to a laidback reggae groove, while Busy Signal and Joeboy apply unexpected sweetness to the go-all-night tropical-house anthem “Sun Comes Up.” Diplo once again puts his contacts list to good use: Nicki Minaj’s brash tone is a perfect match for the rubbery dembow of “Oh My Gawd,” and J Balvin’s authoritative baritone provides a grounding presence amid the kinetic explosion of “Que Calor.” The album’s biggest curveball is the presence of Marcus Mumford, who brings heartland gravitas to the twangy “Lay Your Head on Me.” File that song, with its acoustic strumming and Caribbean drums, under “future country”; only Diplo could come up with a fusion like that.