Mary had a baby. In a program from 2013, Andrew Patner shares the 1973 Brewster LP recording wherein The Chicago Children’s Choir merrily sings about this event (and more).
Stream: Critical Thinking with Andrew Patner: A 1973 Chicago Children’s Choir Christmas

Christmastime in the Chicago Loop, ca. 1969 (Photo: Victor Grigas, CC BY-SA 2.0, cropped and brightened, via Wikimedia Commons)