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About six months before rapper-producer Kevin Abstract launched wildly popular hip-hop boy band Brockhampton in early 2015, he dropped his debut mixtape, MTV1987. Abstract had tapped a few guests to contribute vocals, including an aspiring pop artist from Chicago’s west suburbs named Jack Larsen—that’s him singing the sublime hook for “27.” Larsen has since joined the roster of Chicago hip-hop label Closed Sessions, and in October it released his ambitious debut album.…