However as a thought experiment i'll try to divorce the quality of music beyond my own personal values and try to create a standard that is beyond the whims of my own personal taste.
Now some people especially academics may believed craftsmanship, expressive content, originality, historical importance as an "objective" standard in judging music. However my view is that those elements are merely means to the end to the point of music.
The end point of music is simply appreciation whether intellectual, emotional, aesthetic appreciation etc.
Originality matters because individual listen to music values originality and hence the knowledge that the work is original gives the person an appreciation of the work. Originality is only important as a means to the end not as an end itself. If another person gets appreciation by another component of music (let say the find the music memorable and catchy) it effectively achieved the same end point of music via a different method
So I believe in the following axioms.
1. Appreciation is the point of music
2. Every individual is "equal" whether in the present, past or future.
3. Music that creates appreciation to a greater number of people throughout the history of man kind is better than music that creates appreciation to less people.
4. The reasoning behind the appreciation is irrelevant. An individual valuing it for intellectual reason is just as important as an individual value it it for "shallow" reasons. I make no distinction as every individual values are "equal"
Now a question may be asked, are you simply saying that popularity = good?
The answer is no as popularity implies a sense of transient appreciation. A work that is appreciated in a short period of time and then forgotten a few years later develops less appreciation than a piece of music that is appreciated across generations. Like I mention before individuals in the present are "equal" to the individuals of the past who are long dead and the hypothetical individuals of the future. A music that is valued across generations would cumulatively create more appreciation across the history of the human race then a piece of music that only has popularity in one generation.
It is popularity + longetivity that makes music to be "objectively" good not just popularity.
So if I think about what type of music would "objectively" the highest form of music in western cultures. I would say Christmas carols. Some of these carols have existed for hundreds and even thousand of years and people have appreciated them all these years and I don't see that changing in the future. It cumulatively bring more joy and appreciation in the history of mankind then any other piece of music.
Merry Christmas everyone