Ask and you shall receive ... - 12/17/16

I put out a call for holiday-themed puzzles last week, and I received a nice selection of them.  The one I'm featuring today is from a series of 35(!) Christmas carol-themed caches that form a geo-art Christmas tree in Wisconsin.  I was very familiar with the images used the first 24, having used them in a cache of my own, but the one in this puzzle was one I hadn't seen before:

CCC 33

Tomorrow we'll ...