The latest from rising Chicago rap wunderkind Chance the Rapper, “Good Ass Intro” is a lot lighter and friendlier than the track that preceded it: “Acid Rain.” But Chance the Rapper manages to be funny without seeming cartoonish or cute; he manages to be big and bold without overdoing anything or making empty gestures. A swift, spring-feverish jam, “Good Ass Intro” is everything its title – and the hype surrounding Chance – promises it will be.