In the late ’90s, with a young, criminally underrated crew hell-bent on partying its way out of the projects, unheralded Uptown label Cash Money Records had the hip-hop charts in its sights, a real big chip on its shoulder and the hottest producer in the Dirty South in its pocket: Mannie Fresh, the maestro whose booty-dropping bass lines paved the way for Juvenile, Lil Wayne, B.G., the Hot Boyz and the Big Tymers’ multi-platinum hits. More than a decade remove...