One of my favorite Christmas numbers is Mendelssohn's "There Shall A Star From Jacob Come Forth", and our Choir is singing it this year (https://www.bing.com/videos/search?q=Mendelssohn+Thre+Shall+a+Star&&view=detail&mid=4B082AFED02AF747BBC04B082AFED02AF747BBC0&&FORM=VDRVRV--not us). There are parts of the "Messiah!" that I'm fond of, too--not necessarily the ones that most other people have as favorites. There is an "Ave Maria" by Franz Biebl for 4-part men that is just stunning (https://www.bing.com/videos/search?q=ave+maria+biebl&&view=detail&mid=885E978E8DA3D8F94309885E978E8DA3D8F94309&&FORM=VDRVRV), and there is an "O Magnum Mysterium" by Jacob Handl (Jacobus Gallus) for 2 4-part men's choruses that is great sung antiphonally (https://www.bing.com/videos/search?q=handl+o+magnum+mysterian&&view=detail&mid=F4E0786B4B633FD24E33F4E0786B4B633FD24E33&&FORM=VDRVRV).