Sing We Now of Christmas/God Rest Ye Merry, Gentlemen
This is based on an arrangement by Owen Griffin, with alterations by the artist. Owen Griffin is an organist, pianist, and arranger who recently retired from Hyde Park Baptist Church in Austin, Texas,after serving on their music staff since 1983. He is a graduate of Baylor University with a Master of Music Degree (1979).
The sheet music for this seems to be permanently out of print. You may find it from time to time on Ebay or the Amazon marketplace. (from the collection: The Big Brown Book of Organ Solos)
You get to hear some of the sparkling flutes on the Schantz, along with solos on the Swell Oboe, Choir Rohr Schalmei, and the Swell Bassoon.