Busta Rhymes and Eminem evolved from powerhouse underground MCs into two of the most consistently entertaining forces in late-’90s MTV, and both of them have continued to score radio hits over the years while flexing rapping with wild technical panache. Now they’ve teamed up on “Calm Down,” a six-minute song from Busta’s upcoming E.L.E.2 that’s been described as a battle track by producer Scoop DeVille. The two rappers don’t really go back and forth here, though; instead, they each take one lengthy turn unspooling twisty lyrical acrobatics over a loop of the horn into from “Jump Around” (itself a sample of Bob & Earl’s 1963 single “Harlem Shuffle”). This thing is very entertaining, but Eminem still insists on using homophobic slurs, so that’s no fun. Listen below.