They're all universal not because of any melting pot theories, nor because of any superiority or intrinsic universality, but because the USA has, for many years, been very good at flooding the rest of the world with its products, particularly in "cultural" areas

Okay, let me see if I've got this right... First of all they implement a diaspora of Africans with the prime intention of allowing their native musics to intermingle with that of the European settlers who have also found their to the New World. And lo! Jazz, Blues, Gospel, R&B, Rock n' Roll sprung into being in this carefully controlled environment of cultural conspiracy; and the Illuminati sat back and saw that it was good. They then sent it forth as a virus to corrupt and poison the pure indigenous folk musics of the world, many of which had gone into their evil mix in the first place. Thus did the ports of England become points of infection - Liverpool, for example, whose disaffected working-class youth were all too vulnerable to this evil seed, with young men such as John Lennon finding their nasal Scouse voices weirdly suited to the timbres of this vile product that was R&B; likewise on Tyneside, where one Eric Burdon was similarly infected. And so it was The British Invasion took the music back to their American masters, who saw that it was good, and thus was born modern pop music in all its myriad and vile forms. And so it came to pass that the youth of England did lay aside their unaccompanied English folksongs, English concertinas, English citterns, English Country Dances and English Morris Dances, and sold their English souls to the corporate evils of Pop Music - which is one of the American Genres, that should be performed by American citizens, in places such as Atlanta.