Hi Bill,
I got a few midifiles a few years back for old old PSR 1500. I 'm pretty sure they are midi spot for Tyros. Tried them on my psrs 950 and they sound really good.
I just got them for the odd song that I couldn't find a style for.
As others have probably mentioned, stick to Yamaha files rather than just general midi.
They'd be better tweaked for your keyboard.
It can become an expensive exercise buying them. Although there's a lot of free ones online, one has to weigh up the pro's and cons of maybe having to edit/tweak freebies vs
getting ones that sound good straight away.

I think the midi spot site has demo's to listen to.