Also, Pete Waterman is an old man who is always going to hyperbole his life away, but he isn’t THAT wrong about the Rick Astley thing, though the date is slightly the issue. He was HUGE in late 87/88 - four US top tens and two number ones there, and that album sold 15 million copies Wikipedia tells me. Other than Jackson and Whitney, I can’t think off the top of my head who would have done the same in that same period. Never Gonna Give You Up must have been close to the biggest single of that period worldwide? Certainly the biggest retrospectively too.