Mozart and... well just Mozart, managed to reach perfection. Perfection in music, I believe, is like perfection in math: "2 + 2 = 4". We all know that "2 + 2 = 4" is mathematically perfectly true, even tho is not perfect on every sense; is not perfect visually, is not perfect musically, but is mathematically perfect... it's just true. And Mozart is just that, true. I think music can be perfect, not almost perfect but perfect when the composer makes us focus on the perfect part of his piece, like when we focus on the mathematical meaning of "2 + 2 = 4". If we focus on the visual aspect of the equation then we wont find perfection, but the perfection is there, and I mean real perfection, not almost perfection but absolute perfection, if we focus on the meaning of the equation. The same with Mozart. He reaches perfection, he really, literally does. And he knows how to make us pay attention to the perfection of his music, that in so many other senses will be for sure imperfect.