Why did Beatlemania sweep the USA in the 1960s?

Why did Beatlemania sweep the USA in the 1960s?
Through an analysis of the music, lyrics, fashion and politics of the 1960s, students learn about the cultural impact of the Beatles in the 1960s. They match images of the Beatles to the correct dates through the help of musical clips; examine their album art (and even design their own version of the ‘Sergeant Pepper’ cover); and research other great album covers from rock and pop history.

Part of the new unit on Teen Culture since WW2.