Kris Connor/Getty Images for Capital Concerts
Megan Hilty performs during "A Capitol Fourth 2013 Independence Day Concert" on the west lawn of the U.S. Capitol on July 4, 2013, in Washington.
Kris Connor/Getty Images for Capital Concerts
Barry Manilow performs during "A Capitol Fourth 2013 Independence Day Concert" on the west lawn of the U.S. Capitol on July 4, 2013, in Washington.
Kris Connor/Getty Images for Capital Concerts
Neil Diamond performs during "A Capitol Fourth 2013 Independence Day Concert" on the west lawn of the U.S. Capitol on July 4, 2013, in Washington.
Kris Connor/Getty Images for Capital Concerts
Tom Bergeron speaks during "A Capitol Fourth 2013 Independence Day Concert" on the west lawn of the U.S. Capitol on July 4, 2013, in Washington.
Kris Connor/Getty Images for Capital Concerts
Members of "Motown" perform during "A Capitol Fourth 2013 Independence Day Concert" on the west lawn of the U.S. Capitol on July 4, 2013, in Washington.
Kris Connor/Getty Images for Capital Concerts
Jackie Evancho performs during "A Capitol Fourth 2013 Independence Day Concert" on the west lawn of the U.S. Capitol on July 4, 2013, in Washington.
Mark Stehle/Invision/AP
John Mayer performs with The Roots at the "Philly 4th of July Jam" on July 4, 2013, in Philadelphia.
Mark Stehle/Invision/AP
Ahmir "?uestlove" Thompson of The Roots performs at the "Philly 4th of July Jam" on July 4, 2013, in Philadelphia.
Mark Stehle/Invision/AP
Ne-Yo performs at the "Philly 4th of July Jam" on July 4, 2013, in Philadelphia.
Mark Stehle/Invision/AP
Hunter Hayes performs at the "Philly 4th of July Jam" on July 4, 2013, in Philadelphia.
Mark Stehle/Invision/AP
Grace Potter performs at the "Philly 4th of July Jam" on July 4, 2013, in Philadelphia.
Mark Stehle/Invision/AP
J. Cole performs at the "Philly 4th of July Jam" on July 4, 2013, in Philadelphia.
Mark Stehle/Invision/AP
Jill Scott performs at the "Philly 4th of July Jam" on July 4, 2013, in Philadelphia.
NBC
Miguel, left, and Mariah Carey rehearse for their performance during the "Macy's Fourth of July Fireworks Spectacular" in New York.
NBC
Selena Gomez rehearses for her performance during the "Macy's Fourth of July Fireworks Spectacular" in New York.
NBC
Tim McGraw rehearses for his performance during the "Macy's Fourth of July Fireworks Spectacular" in New York.
Actor Zachary Levi, left, and Nick Cannon during the "Macy's Fourth of July Fireworks Spectacular" in New York.
