Judging by industry sales, it safe to assume--at least in the past anyway--that Christmas music has been an important part of the Season.
I grew up with it and special special memories. Back in the day--vinyl. Samplers were the bomb. Everybody put out great long playing samplers. Even those you would not expect like Firestone Tires. And often with world class peformers. My own introduction to "medievalism" came from an Ames Brothers recording of Good Kind Wencelas--actually an after Christmas carol. Funny how 2 and half minutes can change your worldview.