Psychology is as important as substance. If you treat people with respect, they will go out of their way to accommodate you. If you treat them in a patronizing way, they will go out of their way to make your life difficult.
I have personally seen statements that were longer than some books I have read.
There was always a lot of American music in England until, obviously when the Beatles came around, then there was a shift towards English music, but before then American music was the main thing.