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 WPP's Martin Sorrell Sounds Off at Cannes See Video of His Seven-Minute, Show-Stopping Performance By Laurel Wentz, Published on June 22, 2006 2 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. Become a Member Already a member? Log in.