Pitch tracking

Juan Pablo writes about 'Autocorrelation Pitch Tracking' in his ISMIR 2000 paper. Seems like the best option for my work. From my research, there are many other approaches, the most popular of which seem to be:

• Maximum likelihood
• The short-time average magnitude difference function (AMDF)
• And many more...

An interesting explanation of two pitch tracking (or fundamental frequency estimation) approaches exists here.

p.s. And there's more:

• Bozena Kostek provides a good discussion on Pitch Detection Algorithms (PDAs) in her paper "Musical Instrument Classification and DUET Analysis Employing Music Information Retrieval Techniques."
• High accuracy and Octave error immune pitch detection algorithms

And again! A discussion on robust F0 estimation exists in the Auditory forum here.