[via Boing Boing] 10 + 100 Creative Commons Christmas Songs. I’ll be paying specific attention to A Medieval Christmas. Greg and I actually worked up a set book of obscure Christmas-related folksongs a few years ago but never really nailed the set. Looking at some really old European source material would be a great place to continue the project. i suppose looking at popular sheet music favorites of the 1840s to 1860s would be another good place to dig.