[declnz]

> A song could reasonably have a chord progression such as {Am, G, D, Am, G, Dm}, and the inclusion of both {D} and {Dm} would cause conflicts. Given that music theorists cannot agree on this stuff, there doesn't seem to be anything a computer can do that is better.

Whilst I'm no expert, I'm pretty sure we have hundreds of years of examples of borrowed chords [1] for music theorists to agree upon, so yes plenty of things a computer could do better (as per other comments).

[1] https://en.wikipedia.org/wiki/Borrowed_chord

[olivierduval]

Actually, music is a living art... so for example some blues chords progression would be "impossible" in classical music. And some "free jazz" or multimodal progression wouldn't work in blues

The point is: a computer is good to analyse something following a fixed set of rules, but not so good to analyse something that work by "breaking rules", like art. It's quite "easy" to write some program for classical music, or blues, or rock, or any specific music style... but it will hardly work for a different music style because the progression and interpretation of chords will be different