Hi
If you try simple web-searc from. i.e. Google
or Alta-Vista for midifiles, and you'll find
a lot of free files, and also webshops etc. to
buy from.
Just download to your PC from some of the
tousands pages around, and copy to a diskette
to use in your keyboard.
Good luck.
GJ

Here is ,maybe a start for you: http://www.eatsleepmusic.com/Midi/getmusic/albums/moreinfo.cfm