for those who play piano and use it to learn tunes, here are two programs which can be helpful in different ways..

MidiColors will play midi tunes, showing you what is happening as a set of colored piano keyboards.

TinyPiano allows YOU to play tunes on your computer keyboard..it is 'almost' intuitive. I don't play piano, and I can pick out tunes. You can record and replay also.

hope it helps someone.