You’ve read all of your free items this month. To register, get added benefits and unlimited access to articles, Become a Member. Already a Member? Sign in. Advertising Age Article Abstract What's the Most Viral Moment in Pop-Music History? The Beatles on 'Ed Sullivan'? Michael Jackson's Motown Moonwalk? Psy's 'Gangnam Style' Video? You Decide By Simon Dumenco, Published on September 30, 2013 7 Want more Access, Content & Connections? Upgrade to Membership. We are glad you are enjoying Advertising Age. To get uninterrupted access and additional benefits, become a member today. Register Now Already a member? Log in.