Abstract: Music recognition is carried out by accepting a musical score of musical elements in a digital format, transforming the digital format into a composite musical data object that models the musical score, defining the key signatures in the composite musical data object probabilistically, computing start times to play musical elements in respective measures of the composite musical data object without regard to rhythmic values of other musical elements in the respective measures, and generating an output including the defined key signatures and computed start times.

Abstract: A method for audio processing includes receiving in an electronic processor an audio input from a performance of a musical piece having a score. A two-dimensional state space is defined, including coordinates modeling the performance, each coordinate corresponding to a respective location in the score and a tempo of the performance. For each of a plurality of times during the performance, a probability distribution is computed over the two-dimensional state space based on the audio input. Based on the probability distribution, the performance is matched to the score.