Rap music should be outlawed even if it takes an Act of Congress to do it. As a child of the fifties, I’m well aware of the fits that popular music caused my parents’ generation. Rock and roll was blamed for everything from teenagers’ Brylcreem ducktails to lewd dancing to juvenile delinquency. Fifties rock and roll, though, seems high art compared to what saturates the airwaves today. Back then, religious and civic leaders fulminated from pulpit and public square alike in condemning “the devil’s music.” In a famous and widely seen newsreel clip, the president of a citizens’ council from...