VIDEO : John Legend, Usher, Tony Bennett Lead Sinatra Grammy Tribute Concert

John Legend, Usher, Maroon 5's Adam Levine, Tony Bennett, Alicia Keys, Garth Brooks and Carrie Underwood will honor the musical legacy of Frank Sinatra with Sinatra 100 ? An All-Star Grammy Concert. The TV special, honoring the nine-time Grammy winner's 100th birthday, will be held Wednesday, December 2nd at Wynn Las Vegas' Encore Theatre and broadcast Sunday, December 6th from 9 to 11 p.m.