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At the end of “Crown,” on G Herbo’s debut album, Humble Beast, the Chicago rap star ad-libs an anecdote about walking home from school one day as a child and becoming starstruck at the sight of Terrance Boykin, aka Bump J. In the 2000s, few local rappers cast as big a shadow as Bump, leading hip-hop mogul Lyor Cohen to track him down and offer him a $1 million deal with Atlantic. Bump coulda been an international star, but after a few singles (one with Rick James, two produced by Kanye), he left the major label in 2006.…