Mystery

Why is a piece of music a masterpiece while a lot of them simply aren't? Is it due to an inherent attribute that the piece has like a universal beauty or is it an attribute that we people give to that? What does Beethoven's music have that makes it a masterpiece? Harmony? Novelty? What is beauty? Is it all relative and relational or there is a set frame for beauty out somewhere? If it is us who give a piece of art beauty not the piece itself, then the piece wouldn't be a masterpiece by itself. What is in a face that we say it is beautiful?