A near completely free software and free culture production:

Original song is in the public domain
I've waived all my copyright and related rights with CC0
Recorded in Ardour using KXStudio under Debian GNU/Linux
Drums powered by Drumgizmo and the DRSKit
Video edited and produced using Kdenlive
Will make stems available (just haven't put in place a mechanism for publishing them yet)

https://blaise.ca/music/christmas/