A fan of the late Michael Jackson dances during a memorial service in Hong Kong, July 4, 2009. Jackson, the child star turned King of Pop who set the world dancing but whose musical genius was overshadowed by a bizarre lifestyle, died on June 25, 2009.  REUTERS/Tyrone Siu (CHINA ENTERTAINMENT OBITUARY)Reuters - More than half a million fans from around the world applied for 17,500 free tickets to Michael Jackson's public memorial service next week, organizers said on Friday as a massive security operation got underway.