Harmonic entropy

Harmonic entropy is a measure of how much variety there is in music. It can be used to compare two different pieces of music to see how similar or different they are in terms of the sequence of notes and chords that are used. To measure the amount of variety, harmonic entropy takes into account how often different notes, chords, and rhythms are used and how often they appear in a row. So if two pieces of music contain the same notes and chords in the same order, they have low harmonic entropy, but if they use a variety of notes, chords, and rhythms in a different order, they have high harmonic entropy.