My brother-in-law is giving us the old Mac Mini he doesn't use anymore (I think it's a PPC). My 4 year old daughter is getting interested in playing the piano. I purchased the M-Audio KeyStudio 49 during the Apple.com Black Friday Sale. I can have her play around in Garage Band, but I'd like to find some educational/teaching software. Anyone have any suggestions. I'm preferring something with a game involved, to motivate the teaching. I found http://www.pianowizard.com/, but it looks like Guitar Hero for piano, and I think that may be a bit much for a 4 year old. Any suggestions?