Systems, Devices, and Methods for Harmonic Structure in Digital Representations of Music

A system for encoding a harmonic structure of a musical composition in a digital data structure, wherein the musical composition includes a sequence of bars encoded in the digital data structure, the system comprising:

• at least one processor;
• and
• a non-transitory processor-readable storage medium communicatively coupled to the at least one processor, the non-transitory processor-readable storage medium storing processor-executable instructions and/or data that, when executed by the at least one processor, cause the at least one processor to:
• determine a respective note sequence fingerprint of each bar in the musical composition, wherein the processor-executable instructions and/or data that, when executed by the at least one processor, cause the at least one processor to determine a respective note sequence fingerprint of each bar in the musical composition, cause the at least one processor to, for each bar in the musical composition:
• sort all notes in the bar by note start time and, for each note start time, sort all corresponding notes by note pitch;
• compare the respective note sequence fingerprints of respective bars in the musical composition to identify sets of harmonically equivalent bars;
• assign a respective harmonic equivalence category to each bar in each respective set of harmonically equivalent bars;
• and
• encode the respective harmonic equivalence category of each bar in the digital data structure.

A computer program product for encoding a harmonic structure of a musical composition in a digital data structure, wherein the musical composition includes a sequence of bars encoded in the digital data structure, the computer program product comprising:

• processor-executable instructions and/or data that, when the computer program product is stored in a non-transitory processor-readable storage medium and executed by at least one processor communicatively coupled to the non-transitory processor-readable storage medium, cause the at least one processor to:
• determine a respective note sequence fingerprint of each bar in the musical composition, wherein the processor-executable instructions and/or data that, when executed by the at least one processor, cause the at least one processor to determine a respective note sequence fingerprint of each bar in the musical composition, cause the at least one processor to, for each bar in the musical composition:
• sort all notes in the bar by note start time and, for each note start time, sort all corresponding notes by note pitch;
• compare the respective note sequence fingerprints of respective bars in the musical composition to identify sets of harmonically equivalent bars;
• assign a respective harmonic equivalence category to each bar in each respective set of harmonically equivalent bars;
• and
• encode the respective harmonic equivalence category of each bar in the digital data structure.