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In the past few years Chicago rapper-singer Rich Jones has increasingly softened his delivery and drawn out his vocals. These days, it can be difficult to trace the strains of rap DNA that remain crucial to his work, but they’re still there in the way he paces himself, the way he ends each verse with a definitive verve, and the way his singing is inflected with a swagger that suggests he could turn and rattle off 12 bars on a dime.…