Memphis’ simmering supremacy among contemporary rap locales owes much of its current clout to Young Dolph. Projects such as 2017’s Bulletproof, which Dolph was emboldened to make after multiple near-death experiences, have often put him firmly at the center of the narrative. For Dum And Dummer, however, the Paper Route Empire boss shares the proverbial spotlight with his signee Key Glock, a young local with a growing national profile. A fitting pair despite the age difference, they trade bars like trap naturals over Bandplay productions like “Back to Back” and “Baby Joker,” mixing rubber-band business with luxury brand name-drops. Elsewhere on this stacked hour-long effort, the pair split off for their own gratifying cuts, with Dolph wetting his beak on the lascivious “Juicy” and Glock reflecting on his good fortune on “Monster.”