There are many firms selling midifiles with styles and sheet music. Try e.g. the following:
Midi Hits at http://www.midimarket.com
Hage at http://www.hageshop.de
Styles&Musik at http://www.styles-music.de
You should be able to find more from Music magazines like the German Keyboards.
Another way is to use a sequencer program like Cubase, which can generate the chord symbols automatically, if you only have the midifile available. You can then just print the sheets.
Well, you cannot generate the style file this way. But there's a program for that, too. EMC makes a program called Style Works, which can generate a style file from a midifile. You need to tell to the program the start and end points of the patterns inside the midifile, so it is not completely automatic. The program is not cheap, though.
You can find them at http://www.tastenshop.com/
Hope this helps.
[This message has been edited by kari1 (edited 06-03-2000).]