The success of such a machine de- pends on the material used in it.
In the music classroom, there are a lot of great tools to help teachers keep up with their student's progression and success. At the IMEA conference, there were presentations for all kinds of new material that would essentially "teach" the music to the students and keep track of their success. Some examples are McGraw Hill's 'Voices in Music' and 'SmartMusic' by Finale.