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U.S. pop artist Bruno Mars poses with a football at a news conference for the Super Bowl LXVIII in New York, New York, USA 30 January 2014. Mars will perform in the Halftime Show and also be joined by US rock band Red Hot Chili Peppers. This year's Super Bowl will be played on 02 February 2014. EPA/TANNEN MAURY ( USA NFL SUPERBOWL ENTERTAINMENT )

Grammy award winning soprano, Renee Fleming, poses with a football at a news conference for the Super Bowl LXVIII in New York, New York, USA, 30 January 2014. Fleming is the National Anthem singer and the first opera singer to perform at the Super Bowl. This year's Super Bowl will be played on 02 February 2014. EPA/TANNEN MAURY ( USA NFL SUPERBOWL ENTERTAINMENT )

U.S. pop artist Bruno Mars speaks at a news conference for the Super Bowl LXVIII in New York, New York, USA 30 January 2014. EPA/JASON SZENES ( USA NFL SUPERBOWL ENTERTAINMENT )

Grammy award winning soprano, Renee Fleming, poses with a football at a news conference for the Super Bowl LXVIII in New York, New York, USA, 30 January 2014. EPA/JASON SZENES ( USA NFL SUPERBOWL ENTERTAINMENT )

Bruno Mars who will headline the half-time show at the NFL Super Bowl XLVIII football game hold the game ball during a press conference Thursday, Jan. 30, 2014, in New York. (AP Photo/) ( Super Bowl Football )

Grammy award winning soprano, Renee Fleming, poses with a football at a news conference for the Super Bowl LXVIII in New York, New York, USA, 30 January 2014. EPA/TANNEN MAURY ( USA NFL SUPERBOWL ENTERTAINMENT )

U.S. pop artist Bruno Mars speaks at a news conference for the Super Bowl LXVIII in New York, New York, USA 30 January 2014. EPA/TANNEN MAURY ( USA NFL SUPERBOWL ENTERTAINMENT )

Grammy award winning soprano, Renee Fleming, speaks at a news conference for the Super Bowl LXVIII in New York, New York, USA, 30 January 2014. EPA/TANNEN MAURY ( USA NFL SUPERBOWL ENTERTAINMENT )

Grammy award winning soprano, Renee Fleming, speaks at a news conference for the Super Bowl LXVIII in New York, New York, USA, 30 January 2014. EPA/JASON SZENES ( USA NFL SUPERBOWL ENTERTAINMENT )

U.S. pop artist Bruno Mars speaks at a news conference for the Super Bowl LXVIII in New York, New York, USA 30 January 2014. EPA/TANNEN MAURY ( USA NFL SUPERBOWL ENTERTAINMENT )

Opera singer Renée Fleming speaks at the Pepsi Super Bowl XLVIII Halftime Show Press Conference at Rose Theater, Jazz at Lincoln Center on January 30, 2014 in New York City. (Photo by Larry Busacca/Getty Images) ( 465928759 )

U.S. pop artist Bruno Mars smiles at a news conference for the Super Bowl LXVIII in New York, New York, USA 30 January 2014. EPA/TANNEN MAURY ( USA NFL SUPERBOWL ENTERTAINMENT )

U.S. pop artist Bruno Mars speaks at a news conference for the Super Bowl LXVIII in New York, New York, USA 30 January 2014. EPA/TANNEN MAURY ( USA NFL SUPERBOWL ENTERTAINMENT )

Opera singer Renée Fleming speaks at the Pepsi Super Bowl XLVIII Halftime Show Press Conference at Rose Theater, Jazz at Lincoln Center on January 30, 2014 in New York City. (Photo by Larry Busacca/Getty Images) ( 465928749 )

Bruno Mars who will headline the half-time show at the NFL Super Bowl XLVIII football game speaks during a press conference Thursday, Jan. 30, 2014, in New York. (AP Photo/Charlie Riedel) ( Super Bowl Football )

Opera singer Renee Fleming who will sing the National Anthem before the NFL Super Bowl XLVIII football game holds the game ball during a press conference Thursday, Jan. 30, 2014, in New York. (AP Photo) ( Super Bowl Football )