NBC has declared that Thursday’s airing of “The Sound of Music Live!” was such a ratings success that it needs an encore: The net will re-air the musical event at 8 p.m. Saturday, Dec. 14.

The original airing drew a 4.6 rating in adults 18-49 and 18.6 million viewers, with a small live+3 gain to 5.5 in 18-to-49-year-olds. The total viewers grew to 21.3 million.

Interestingly enough, the re-airing of this event is bumping out another holiday tradition: “It’s a Wonderful Life,” which was originally scheduled to air on Saturday, will now air at 8 p.m. Dec. 20. It will compete against two colorized versions of “I Love Lucy” on CBS.