Christmas long over (start counting the days to the next one now!) but searching Christmas carols on the internet, I found the "Christmas in the Cookhouse" midi on the City of Bremem (Germany) Xmas website, with the tune, "God Rest Ye Merry Gentlemen." God rest... is not listed.
Email postcards with selected midi were available to send out. I hope the service will be available for this coming Christmas.
www.hansestadt-bremen.de/postcard/xmas2/