I don't speak cockney and I don't pretend to come from that part of the world. For the longest time the English, like the Beatles and so on sounded American. "She loves you yeah yeah yeah!" All of the sudden you sound American. It doesn't work that way with Americans who try to sing English. It's not convincing. If I say "Footy" and "tele" and "Brissy" and "Sydney" and "Simmo" it's not convincing.