[Haskell-beginners] for those who wondered where I was...

[Marc Weber]

> It took me a few weeks to get a basic input system working. I.e. 
> MusicXML documents translated into my own representation, and reasonable 
> error checking.

Check out lilypond.
http://lilypond.org/about/faq

It can process MusicXML to .ly and .ly to .midi
However I think that there are some shortcomings using this chain

Still lilypond may be of interest to you.

Marc Weber