Music data processing method and program

A non-transitory computer readable medium storing a program that causes a computer to function as:

• a performance analysis module that estimates a performance position within a musical piece by analyzing an audio signal that represents a performance sound;
• and
• a first updating module that updates a tempo designated by music data that represent a performance content of the musical piece, such that a tempo trajectory corresponds to a transition in a degree of dispersion of a performance tempo, which is generated as a result of estimating the performance position with respect to a plurality of performances of the musical piece, and a transition in a degree of dispersion of a reference tempo, which is prepared in advance,
• the first updating module updating the tempo designated by the music data such that the performance tempo is preferentially reflected in a portion of the musical piece in which the degree of dispersion of the performance tempo falls below the degree of dispersion of the reference tempo, and the reference tempo is preferentially reflected in a portion of the musical piece in which the degree of dispersion of the performance tempo exceeds the degree of dispersion of the reference tempo.

A music data processing device, comprising:

• an electronic controller including at least one processor,
• the electronic controller being configured to execute a plurality of modules including
• a performance analysis module that estimates a performance position within a musical piece by analyzing an audio signal that represents a performance sound;
• and
• a first updating module that updates a tempo designated by music data that represent a performance content of the musical piece, such that a tempo trajectory corresponds to a transition in a degree of dispersion of a performance tempo, which is generated as a result of estimating the performance position with respect to a plurality of performances of the musical piece, and a transition in a degree of dispersion of a reference tempo, which is prepared in advance,
• the first updating module updating the tempo designated by the music data such that the performance tempo is preferentially reflected in a portion of the musical piece in which the degree of dispersion of the performance tempo falls below the degree of dispersion of the reference tempo, and the reference tempo is preferentially reflected in a portion of the musical piece in which the degree of dispersion of the performance tempo exceeds the degree of dispersion of the reference tempo.