110th Audio Engineering Society Convention, Amsterdam, Netherlands, 2001. Audio demonstrations Klapuri, Virtanen, Eronen, Sepp nen. Please notice, that the overall transcription system has not yet been optimized at all. The multipitch estimator does not even utilize the context - it just looks at each segment of the input signal at a time and finds the musical notes in it. Acoustic music is rather easily handled by the transcription system.
Some errors occur, though.
Check the DAFx2000 demonstrations page.