Related Clues:

• Mass number
• Go door to door, possibly
• Girl's name on many people's lips at Christmas
• Devotional song
• Concerned with sacred matters
• "The Brady Bunch" mom
• December tune
• "Silent Night" is one
• One of David's hymns
• Doors tune?
• It's not material for a religious song
• "De profundis," for one
• "Joy to the World," e.g
• The shortest one has only two verses
• Choir number