Interestingly—well, depending on your perspective I suppose, it’s quite possible that everything I’m gonna write seems needlessly academic—I think there’s room for disagreement here! In some sense it’s not at all a coincidence that Mozart knew how to write music that would please his audiences. After all, he had been performing some of the most popular works of his age since he was very young, which led him into the acquaintance of well-known composers whom he doubtless learned from or was influenced by, etc etc.
I don’t really want to push this too far—I definitely agree that there are aspects of Mozart’s work that are uniquely his. Just to suggest that his genius was not solitary, Ayn Rand-ian might by which alone he gave us such beautiful works. Instead, I actually find it interesting to consider the relationships and social conditions that made it possible for Mozart’s genius to blossom as it did.