Here's a bit of organ history from about 1985. The Genius series of Lowrey organs had a cartridge slot to expand the rhythms and styles available. At one point they released a Christmas Song cartridge.
This is my Lowrey GX-225 playing the music, not me. All voices in these organs were digitally controlled analog.
This is almost 18 minutes of music.

https://app.box.com/s/r5rbrh7hrydd64wgq6w7ohgyios0p1x4

Dave,

Thanks for posting this. Some really nice Christmas numbers played here to get us in the Christmas mood. As you say, it plays for 18 minutes .. so perfect for having it playing in the background whilst one is doing something else.

Hugh

Hi there Dave,
I enjoyed the performance and the voicing was great on that Lowrey my good friend a nice selection.

Jon D.