There are some tools that I could find but so far none has come up with good conversion from FLAC or MP3.

I'm mainly interested in classical music and that kind of complicates things. As the number of voices in your audio increase, it gets that much harder to export it to MIDI. I've been thinking about emphasising the melody line and exporting that to MIDI but so far nothing :P

Perhaps a different approach would work better.

But thanks a lot for the help :)