The Crazy Rise and Epic Fall of Backstreet Boys and NSYNC

They were huge. They sold more records than almost anyone. They toured the world. They dominated MTV. Then they were gone. Here's the story of where the Backstreet Boys and NSYNC came from - and why they vanished. 

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Everybody has a favorite boy band -- some studly group that sings tightly harmonized love songs and rocks feverishly groomed styles. They rake in big money -- like, big. They sell out stadiums.