I noticed this in yesterday's mail and downloaded the abstract:

ACOUSTICAL SOCIETY OF AMERICA, Abstracts of Papers from the 130th
Meeting, St. Louis, MO, 27 November - 1 December 1995

Automatic recognition of musical notes.

Jimmy H. Kapadia, John F. Hemdal, Dept. of Elec. Eng. and Comput.
Sci., Univ. of Toledo, Toledo, OH 40406

A system for the automatic recognition of musical notes was designed
and implemented on a IBM-PC using commonly available hardware. The
input to the system was a recorded piece of monophonic music while the
output was its musical score. The recognition was carried out in the
time as well as the frequency domains. Different characteristics of
the note, like its frequency (or its name) and its time value, were
found. The approach for this project was primarily from a digital
signal processing (DSP) point of view. Various DSP fundamentals, like
comb filter analysis and cepstrum analysis, were used for achieving
the ends. The emphasis was more on trying out different approaches
than on achieving a desirable result. Finally, an attempt was made to
recognize a chord.

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Sort of rudimentary, but applicable, and especially intriguing if you
have a deviated cepstrum that you'd like to have analyzed.

My son tells me that he can buy a guitar pickup that outputs in MIDI
from an acoustic or electronic guitar with no trouble. This is
apparently not a one-note application.

Karl A. Petersen