I am listening to the theme music of a movie soundtrack. While I enjoy the theme

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I am listening to the theme music of a movie soundtrack. While I enjoy the theme music there is nonetheless something about it that strikes me as inauthentic and hallow. The thing is that I can't point to what it is that I find inauthentic. Maybe I might say that the music tries for an unconvincingly and excessively cinematic vastness and grandeur of emotion. But much equally ambitious cinematic music does not strike me as inauthentic. Is it philosophically incoherent to speak of a piece of music as lacking certain virtues such as authenticity when you are not even certain how a piece of music might be called authentic in the first place? How could it make sense? It seems odd to me that I can make such judgments.