P.S. I wrote that BEFORE I listened to the video. I'm not much of a Tyros fan, but I could see how that track was especially made for the song. And it really works well.
But I stick to what I said if you don't have a rhythm track like that that's doing all the work for you.
I also use a lot of "bells" and strings and other sounds to mask a basic rhythm....IF that's all you have available.
I have to say one good thing about the Tyros. They make wonderful styles that are mainstream and carefully thought out. They really do the job for a standard listening/dancing audience. The Korg styles are too complicated and too sterile and......too busy!
As I'm listening to this Sleigh Ride arrangement, I'm realizing the Tyros has everything you need to make you want to play great music rather than locking you up in technology mode.