Point?
Universe is full of contradictions as long as we live in a relative state.
Same philosophers corner of endless discussions if asking about objective good and evil. Or if there is any ovjective truth. It is easier to see that "this action A does more good than action B, we can measure it as we compare".
Or "this X is truer to reality than Y because we can test it out"
So as long as we use rational mind having a limited set of criteria, it can more objectively be said that A is better than B, depending of what we compare.
Just like we also do in sports, a person wins the world championship, and thus announced as "best in the world on..." while theoreticaly that person is only the best performer on a stadium with only a selected few who compare themselves. A farmer somewhere might beat that achievement, but is not at all into sports.
The more narrowly limited, concrete and measurable, the more the rational mind can calculate and rate, the easier it is to say that "this is objectively better than the other".
So my point is that, and the need for a reference.
The more intuitive and less concrete something is, as some art and music can be, the quality of its expression is harder for a concrete measuring labeling mind to say it is objectively good or bad.
If some note is out of tune, someone might say "oh, look it is bad!"
or if the tempo are changing "this is not tight".
But that comes from a reference in the mind of the person who might have no clue about tiny quarter micro tonality, or believes that good music needs to be slave to a metronome, or are unaware of polyrythmics etc.
When art are more intuitive, the question of objectively good or bad somewhat loses its meaning. It often more about if the composition reflects and paints what was intended to be expressed in that work. What was the aim behind it etc.
I short, in some way the will to classify things in good and bad labels, can have its practicality, but in essence it is a dull way to describe and it somewhat relates to some kind af competitive culture.
It is more relevant to ask what someone wants to express and if that comes through as intended. But if the artist had intended to do it in a certain way to raise some awareness, it is more important than if a random person out of context are being asked if it is good.
In some way art and music is a bit theatrical or cinematic and a movie with a lot of dissonance can be beautiful in its way to portrait a life journey. And then we have Sound of Music movie with colorfull landscapes. Show t
it beside a rougher movie and probability is high that a little baby child would prefer Soundofmusic.
So, the question comes down to how one can find beauty even in places not being pretty, or hearing harmony even when there might be a few tritonus along the way.
Is there an i born sense of harmony and beauty?
I think there is. But also one can learn to expand the field to also include more into it. Just as we may not only say that sweet food is "good" food.