Apart from the built in demos on my PSR-740 (which aren't too bad considering the limited amount of memory available), Yamaha do some really astounding XG demo midi files. You wouldn't believe that a keyboard could do all that stuff, though I must say that the high end Yamaha keyboards do contain the same chips as the "professional" XG synths. They must have some really outstanding musicians back at the ranch. The Tyros demos are particularly good - who needs a symphony orchestra now?

Bryan