I submit that for the vast majority of human prehistory, hundreds of thousands of years, music was much worse than even mumble rap and formulaic hits churned out of payola primed radio.
Because there were no musicians. There was just us. There weren't any Fenders, Tribes (the luthier efforts of @meno), or Gibsons. There was just us, and the little flutes we could carve, if we'd been raised right, from the tibias of large birds.
However, while technically and as an industry, music was far worse for hundreds of thousands of years, it was vastly more enjoyed by them as enjoyed it, because they were enjoying making it and expressing the darkness and light in their soul.
Even if it was mumble rap.
Well, this is why I question the use of the word 'worst' here. It's super subjective and I've found myself to thoroughly enjoy, say, medieval music which contains a quality of purity that simply doesn't exist anymore. 'worse' is not right, but lacking in diversity was the real issue for me.
But yes music is funny in that it's an art, but also a craft and a social adhesive, entertainment. Quite unique in that regard I think. We shouldn't forget each element!