TV highlights: The Rockefeller Center tree lighting

NBC heralds in the holiday season again with a dazzling display of musical talent and the lighting of America's most famous tree during the 16th annual "Christmas in Rockefeller Center" (NBC at 8 p.m.) telecast. Musical guests Mary J. Blige, Toni Braxton, Mariah Carey, Kelly Clarkson, Ariana Grade and more perform current hits and holiday classics.