I doubt that there can be objectivity in music. It seems that even the basic notion of consonance is an acquired one, and people learn it from others. But when

I doubt that there can be objectivity in music. It seems that even the basic notion of consonance is an acquired one, and people learn it from others. But when all the people got the idea of consonance as a pleasant sound, this idea becomes a very real thing. One can even say an objective thing. A social reality, where the choice between two hypotheses in your question dissolves because both hypotheses become essentially the same. It is objectively good because we were told it is good. And we were told it is good because it is objectively good. It is just like other phenomena of social reality. Money is valuable because people believe they are valuable, and people believe that money is valuable because money is valuable.