I think I've got a demo version of Melodyne someplace I've yet to really have any sort of decent look at. This just be the push

p.s. and for Joanne: The quickest outline of the midi concept I've used to explain it, that generally translates very well, is:
Midi is a bit like those "paint by the numbers" things that everyone seems to have got as a kid, only with musical elements (note pitch, length etc) instead of colours.