Following our Billboard staff-picked list of the 00 greatest songs of 2000, we're writing this week about some of the stories and trends that defined the year for us. Here, we circle back to *NSYNC's No Strings Attached era one last time, via a frequent collaborator: MTV legend Wayne Isham, who helmed the pop quintet's classic videos for "Bye Bye Bye" and "It's Gonna Be Me."