It was a prelude to their 1999 - 2000 Into the Millennium Tour .
In 1999 , the Backstreet Boys televised a concert for Disney Channel called Backstreet Boys In Concert from the New Amsterdam Theatre .
Backstreet Boys was a prelude to their 1999 - 2000 Into the Millennium Tour .
In 1999 , the Backstreet Boys televised a concert for Disney Channel called Backstreet Boys In Concert from the New Amsterdam Theatre .