"Rock, jazz, blues & pop are universal musical phenomenon initially derived from the African & European cultural melting pot that is North America and historically, culturally & ethnically unbounded thereafter."

American pop/rock music (and I believe that's the only one that's exported in great quantity by America these days) is indeed universal. So are McDonald's, training shoes and baseball caps. 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, e.g. music, clothes, films and eating habits.