Some of my friends have a Rennaisance singing group called Conspiratio, and they have a Christmas album called Wassail! This includes Marie (who has been a character in Girl Genius) Tora (who has helped us pack boxes in the past) and Carol, who used to be our business manager and is now back as half of Cheapass Games, as well as several other amazing people that we don't know nearly as well as we'd like, but we see them around at parties once in a while. You can hear samples and/or buy their album here at bandcamp!