NBC kicks off the holiday season with the annual lighting of the iconic Christmas tree in the heart of New York City with the "89th Christmas in Rockefeller Center." The evening combines festive musical performances by Alessia Cara, Harry Connick Jr., Mickey Guyton, Norah Jones, Brad Paisley, Rob Thomas, Carrie Underwood, and more. Also, the evening includes a duet featuring Paisley and Thomas and a special performance by the Radio City Rockettes.NBC News' TODAY co-anchors Savannah Guthrie, Hoda Kotb, Al Roker, and Craig Melvin host the highly anticipated holiday special. Before the primetime telecast, an additional live hour of the special will be broadcast on all NBC Owned Television Stations and numerous NBC affiliates from coast to coast, starting at 7 p.m. ET. Access Daily and Access Hollywood's Mario Lopez and NBC 4 New York's Natalie Pasquarella and David Ushery host this special live hour.