NBC Nightly News is the flagship daily evening television news program for NBC News, the news division of the NBC television network in the United States, and is the #1-rated newscast in America. NBC Nightly News is produced from Studio 3B at NBC Studios at 30 Rockefeller Center in New York City. Since 2015, the broadcast has been anchored by Lester Holt on weeknights, José Díaz-Balart on Saturday and Kate Snow on Sunday. On weeknights, it is broadcast live over most NBC stations from 6:30-7:00 p.m. Eastern and occasionally updated for Pacific Time Zone viewers in a "Western Edition". Its current theme music was composed by John Williams.