One Direction's songwriters admit their tracks are "guilty pleasure music".
Writing and production team Carl Falk, Rami Yacoub and Savan Kotecha have been behind the boy band's three biggest hits - What Makes You Beautiful, One Thing and Live While We're Young - and say they aimed for a classic sound, rather than what is cool at the moment.
Savan told Billboard magazine: "It felt like everyone tried to do boy bands 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 boy-band guilty pleasure music. We weren't trying to be urban or rhythmic, and [the band and their team] happened to share the same vision."
Carl said an important part of what they tried to create with the sound of the band - Niall Horan, Zayn Malik, Liam Payne, Harry Styles and Louis Tomlinson - was to have catchy guitar parts.
He added: "Each of the songs have signature riffs - something so people can play YouTube [cover] versions of our songs."
He also added as writers they wanted the music to be original, rather than relying on samples or covers of songs which had been recorded before.
He added: "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."