Sweet Tumbling Dissonance

Ever hear a song that you must hear again? An a cappella group at my daughter's high school sang Paul Brandvik's arrangement of "In Dulci Jubilo" ("In Sweet Rejoicing") at their holiday concert. I know the tune well - "Good Christian Men Rejoice" - but have never heard it filled with such beguiling, pressing sounds. I could scry this song if I could see it. . .

 

Guidonian Hand