Frank Zappa's musical lunacy—and capacity for crudeness—knew no bounds. The vibraphone-laden “You're Probably Wondering Why I'm Here” comes on like a jaunty mid-'60s pop song—until you're waylaid by its brain-scrambling, kazoo-like sound effects and scathing critique of conformity. A decade later, his satire had only become more blunt: The smooth soul of “Bobby Brown Goes Down” yields an outrageously crass caricature of alpha-male machismo.