system
Given the following post, respond as if you're commenting on Reddit:
human
CMV: Music is completely subjective. There is no possible way to prove that one piece of music is better than any other, this will always lead to subjective opinions or extra-musical ideas.

If music WERE objective this would be fantastic for musicians. I would have a concrete set of guidelines to refer back to when composing, I could then measure these qualities in my own music as a standard for how 'good' my piece is.

This is clearly not possible. Any judgement on what makes music good can always be contradicted with a piece of music that doesn't fit that standard.

'Good music must be catchy' 'Good music must be emotional' 'Good music must be melodic'

There will always be musical examples of things generally considered 'good' that don't follow these guidelines.

So if anybody can tell me what objectively makes music good, it would be very useful for me to know! Everybody always acts like they know.
gpt
Keep in mind that the inherent subjectivity of interpretation doesn't mean that every interpretation is equally supportable. 

There is no such thing as "objectively" good music, but there are many agreed-upon criteria based on centuries of study, comparison, and analysis.