I posted this response to Branca, which is buried somewhere on page 18 of the responses, but easier to read here.
I don't know that music is over, but the American Century in music -- blues and blues-based music, that is to say jazz, rhythm and blues, rock and roll, even country -- is over. And ... it will be considered one of the great artistic flowerings, like Elizabethan drama, Renaissance painting, baroque music, the Victorian novel. Those all came to an end, and so has the American Century in music.
That doesn't mean music is over. But we may not have the ears to hear the new thing.