Two songwriters behind the hit singles of One Direction have been talking about how they come up with the million-selling music performed by Harry Styles, Zayn Malik, Liam Payne, Louis Tomlinson and Niall Horan.

Speaking to The Guardian, Ed Drewett ('Steal My Girl, 'Best Song Ever') and Fiona Bevan ('Little Things') discussed the work that goes into writing pop hits.

Talking specifically about the One Direction single ‘Little Things’, Bevan stated:

"I often think about who the lead or best singer is, and make sure the song fits their voice in terms of pitch and tone."

She continued: "When One Direction recorded ‘Little Things’, they all equally had a special moment to showcase their vocals. Ed [Sheeran, co-writer] and I hadn’t imagined them sharing out the melody in exactly that way, but it was a stroke of genius on their part in the studio."

Drewett, on the other hand, has a different approach when writing for the boys: “Very rarely do I consider members. You think: One Direction need a first single. It needs to be mid-to-up tempo, have a massive chorus, to sound fresh, but still familiar. That’s how I tailor it to the band.”

Fiona also revealed her thoughts on the classic song format that continues to produce big pop tunes:

“I’d say most boyband songs still follow a very traditional pop song structure which is tried and tested over time to be hugely successful… It’s verse, chorus, verse chorus, middle eight/bridge, double chorus with a possible key change.”

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Listen to some of One Direction’s biggest hits below: