A band apart: how did One Direction conquer the music world?

LONDON, ENGLAND - AUGUST 20:  One Direction fans take their positions in Leicester Square ahead of the premier to the bands new film on August 20, 2013 in London, England. The bands new film, 'This Is Us', will premier this evening at the Empire cinema.  (Photo by Dan Kitwood/Getty Images)
LONDON, ENGLAND - AUGUST 20: One Direction fans take their positions in Leicester Square ahead of the premier to the bands new film on August 20, 2013 in London, England. The bands new film, 'This Is Us', will premier this evening at the Empire cinema. (Photo by Dan Kitwood/Getty Images)

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