If you were alive in the '90s, you probably know the phenomenon called the Backstreet Boys – a frenzy some compared to Beatlemania. With more than 130 million records sold worldwide, they remain the bestselling boy band of all time. And the boys – now men – are back with their biggest world tour in 18 years, and another hit album, "DNA." Tracy Smith talked with Nick Carter, Howie Dorough, A.J. McLean, Brian Littrell and Kevin Richardson, who have never turned their backs on each other.

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