Sydney, June 22 : 'King of Pop' Michael Jackson has been crowned the greatest singer of all time, just days ahead of his second death anniversary.Fans have honoured the late pop star by voting him into top place in a new NME.com poll, reports the Sydney Morning Herald.Jackson, whose score was 9.02 out of 10, beat Queen frontman Freddie Mercury by 0.7 points, while Elvis Presley placed third