"Deck the Halls" is a traditional Christmas, yuletide, and New Years' carol. The melody is Welsh dating back to the sixteenth century, and belongs to a winter carol, "Nos Galan", while the English lyrics, written by Thomas Oliphant, date to 1862.
The tune is that of an old Welsh air, first found in a musical manuscript by Welsh harpist John Parry dating back to the 1700s. The melody Poet John Ceiriog Hughes later wrote his own lyrics. A middle verse was later added by folk singers. In the eighteenth century the tune spread widely, with Mozart allegedly using it in his 18th violin sonata and, later, Haydn in the song "New Year's Night."
Originally, carols were dances and not songs. The accompanying tune would have been used as a setting for any verses of appropriate metre. Singers would compete with each other, verse for verse—known as canu penillion dull y De ("singing verses in the southern style"). Consequently, tunes originally used to accompany carols became separated from the original dances, but were still referred to as "carols".
******
If you like this video subscribe to my channel. There are many more videos like this one lovingly prepared and edited by myself for your enjoyment! Check out my extensive playlist collections as well.