Australian pop-punkers 5 Seconds Of Summer are currently enjoying phenomenal success and their producer, Goldfinger's John Feldmann, has opened up about what it's like to work in the studio with them. 

Speaking to People magazine, Feldmann (pictured left with the stars) explained that he was really surprised by the natural talent possessed by the boys and was proud to work with them all:

"They're a real band. That was my first impression. They're all really good at what they do. I was just blown away. It hasn't changed since day one. They're still the same four guys. They're like brothers. They love each other and know where they came from." 

All Time Low's Alex Gaskarth, who has written songs with the heartthrobs, opened up about their creative dynamic: "Michael and Ashton are goofballs – they brought a ton of energy to the songs we wrote together. Calum and Luke were kind of the quiet ones at first. Once we got going, they started to come out of their shells. They're such hard workers and they're so dedicated to what they're doing that I don't see it slowing down for them."

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Watch Feldmann discussing his music career below: