In 'The Wild One,' angry young rocker Marlon Brando answered an innocent question -- "Hey Johnny, what are you rebelling against?" -- with a curt reply that spoke volumes: "Whaddya got?" Rock never settles for the status quo, teaching generations that questioning authority is a cornerstone of democracy. Take a look at Spinner's
20 Protest Songs That Matter, each spun at 45 revolutions per minute.