Music and masterpieces did exist long before copyright came into existence, however it also existed long before technology to reproduce them existed. Arguing that it didn't exist in the past and it worked fine isn't applicable to current events.
Since 1557 the Stationers' Company enforced the copyright of all published works in the UK until 1709, which then transferred copyright from the manufacturer to the author. Essentially put, all of modern English literature has been covered by copyright in one form or another.
Literature before copyright was fortunate to be read by more than a thousand people. Most of our literary heritage is dependent solely on the work of Monasteries that preserved the works through reproduction for hundreds of years and passed on tomes that would never have survived. The mere fact is, is that copyright followed shortly after the printing press' mass adoption to protect writers from the illegal reproduction of their works on a mass scale.
It's ignorant to argue the world would be better without copyright when copyright has existed throughout the whole of modern western civilization. We wouldn't have many of our greatest works, with original copies still available if it wasn't for the mass production and publication enabled by copyright. Mary Shelley had more copies made of Frankenstein in its first print run (~10,000) than entire authors just a few hundred years before her would manage in their entire careers as an author.
So please, please point to an era of civilization where copyright didn't exist and where mass production of literature, music or art was available and the industry thrived. Because in 1400's a single book was worth equivalent to a farm or vineyard. Universities rarely had more than a few hundred books.
The destruction of the Library of Alexandria would be equivalent to the destruction of a federal reserve. I still fail to see how the argument against copyright always descends into an absurdest world without its existence, where book prices will literally end up costing houses because authors will be forced to make all their profit off of the sale of a single book for a years work. Quite literally it'll be ~$30,000 per book, or copyright will be required in some form to ensure the author is paid his dues.
Culture has never been free, it's just that in recent times it has become free to steal and people have absurdly come to believe that that's how our ancestors lived.