Have you been to other countries (outside of Western European countries)? When the OP talks about culture and influence, I understand his premise on Tupac (even if he trolling some), There was nothing unique about the Beatles, just the slightly bigger act of the pack of other similar artist like The Rolling Stones or The Monkees (who at one time were bigger than both the Beatles and stones combined). Western music will penetrate other markets if there is a demand, it didn't exist. Elvis is prime example of an artist the local as fukk, Europe didn't even gravitate to him like that outside of the U.K., they pump these dudes up. It was funny when I was in Japan years ago, the popular artist were Neyo (the funny part) and Beyonce. Black music and culture just has a way of traveling, just look here in America.