The team behind some of One Direction's biggest hits have revealed they wanted the boyband's music to be "vanilla."
Speaking of The X Factor group's worldwide success to Billboard, Carl Falk, Rami Yacoub and Savan Kotecha revealed they believe the secret to 1D's success is being a guilty pleasure for fans.
Kotecha explained: "It felt like everyone tried to do boybands by going to the cool, hip producers who were coming up.
"We wanted to make it very vanilla. You're aiming for teens and tweens with boyband guilty pleasure music. We weren't trying to be urban or rhythmic, and they happened to share the same vision."
Falk added: "Each of the songs have signature riffs - something so people can play YouTube versions of our songs. We wanted to do something where we didn't copy anything right off. We're trying to do our own thing a little bit, even if it's just guitar parts."
In other One Direction news, the lads were seen shooting a new video on the banks of the River Thames in London yesterday (17th December) - with Harry Styles rejoining his bandmates after a romantic mini-break with girlfriend, Taylor Swift.