“Deck the Halls” is a song in the public domain. So is Handel’s “Messiah” … the whole thing, including the ever-popular “Hallelujah” Chorus. Lots of popular Christmas songs are in the public domain (but lots are not).
What is Handel’s most famous piece from Messiah?
The rousing ‘Hallelujah’ Chorus is one of the most famous pieces of Baroque choral music, and by far the most widely-known section of the work.