I should have added that the MIDI in question provides four easily digestible singing parts for Soprano/Alto/Tenor/Bass. In other words you should be able to find a part in there to suit your voice and practice some nice harmonies before Christmas.
If anyone would like to see the score, I can send a GIF of the notes to someone with some space on a Web-page so that all can share some pre-Christmas singing joy. I'm not into Chat, but perhaps we could arrange a choir practice on-line for the Mudcat Chorale?
Regards, John