Being:

King Wenceslas

Oh Christmas Tree

Drummer Boy

Three Kings

La Divine Enfant

Mahri's Wedding

God Rest Ye Merry Gentlemen

The Holly and the Ivy

Good Christian Men

Deck the Halls

Notes:

If you have some difficulty reading the text, then use the YouTube setting's dialog to change the quality of the text. Press the little gear symbol in the bottom line of the video and change the Quality to HD.