I agree with Josie that after a bit almost any genre will start to sound the same or at least similar. And it is pretty easy to find this in the past as well. Think of all the songs in the 50's that used I/vi/IV/V!

There is always a lot of awesome talent out there who never get fame or fortune and occasionally one of them breaks through. And if the public likes a particular style, one of these artists can certain deliver it! I'm convinced that ALL well-known acts/artists are pretty much interchangeable!