With "Four," One Direction will have issued its fourth album in four years. More radio hits will follow, and the boy band's latest world tour, announced before "Four" even arrived, will likely sell out. But with this many albums under the band's belt (in addition to the march toward maturity by its members as well as its fans), how long before someone pursues solo aspirations?
Business may be booming now for One Direction Inc., but the shelf life of pop groups - particularly manufactured boy bands - has often been temporary. Even the members of the Beatles, the greatest boy band of all time, went solo.
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