Computer-based systems, devices, and methods for generating aesthetic chord progressions and key modulations in musical compositions

A computer-implemented method of determining when within a musical composition to transition to a new musical key, the method comprising:

• segmenting, by a computer-based musical composition system, the musical composition into segments;
• performing, by the computer-based musical composition system, an automated clustering of the segments to group segments that are similar together;
• and
• solving, by the computer-based musical composition system, a constraint satisfaction problem that specifies that:
• every segment is assigned a key;
• segments in a same cluster are assigned a same key;
• and
• segments that abut one another are assigned respective keys that conform to an allowed key to key transition with respect to a key progression generation model.

A computer-based musical composition system comprising:

• at least one processor;
• and
• a non-transitory processor-readable storage medium communicatively coupled to the at least one processor, wherein the non-transitory processor-readable storage medium stores data and/or processor-executable instructions that, when executed by the at least one processor, cause the computer-based musical composition system to:
• determine when to change to a new key;
• determine what new key to change to;
• and
• determine what chords to use while within the new key.