The text mentions songs with a Christmas theme that served as an overture. "Deck the Halls", "Carol of the Bells", "O Come All Ye Faithful", "I Saw Three Ships", "Away in A Manger", "God Rest Ye Merry Gentlemen", and "What Child is This", are the traditional Christmas carols.
Meanwhile, "Have Yourself a Merry Little Christmas" belongs to Hugh Martin and Ralph Blane.
An overture is a piece of music performed by the orchestra at the start of an opera, a play, or a ballet performance. The performers take their positions and wait for the curtain to rise as the overture starts. Since it "opens" the event, the name is derived from the French word "ouverture", meaning "opening". Typically, overtures feature music that will be heard during the opera or ballet. In this way, it gets the audience ready for what's next.
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