NBC continues to roll out the holiday festivities with a dazzling display of musical talent and the lighting of the world's most famous Christmas tree during the 12th annual "Christmas in Rockefeller Center" telecast. Co-hosted by NBC stars Jane Krakowski ("30 Rock") and Zachary Levi ("Chuck") and broadcast in high definition, the star-studded tree lighting celebration will feature Michael Buble, Aretha Franklin, Alicia Keys, Barry Manilow, The Roots, Shakira, and The Radio City Rockettes performing a mix of current hits and holiday classics from beautifully ornamented stages around Rockefeller Center in New York City.