>>128333557
The word "gem" implies a high value ascribed by society for the particular mineral: If it's only hidden, but doesn't sell for a lot at the jewelery store, it's not a gem, but a fucking rock.
The notion of "discovering" music which will have long-lasting acclaim in society is ridiculous; Either the music is of value, then more people than you have already established its worth long before your "discovery", or you have indeed discovered it first, then the odds of it having any worth for society are infinitesimal. If the worth is only for you individually, then its value is sentimental.
tl;dr: There are no hidden gems. There are gems and rocks and their discovery does not alter their (intrinsic and predetermined) worth.