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Tempo Tracking with a Single Oscillator

I describe a simple on-line tempo tracker, based on phase and period locking a single oscillator to performance event timings. The tracker parameters are optimized on a corpus of solo piano performances by twelve musicians. The tracker is then tested on a second corpus of performances, played by the same twelve musicians. The performance of this tracker is compared to previously published results for a tempo tracker based on combining a tempogram and Kalman filter.