Pop punk band 5 Seconds of Summer looks like it's going to ditch its genre. On their second album, they invited the London Symphony Orchestra to play a part. The band is now busy finishing their album and their 'Rock Out with your Socks Out' tour.

Matt Pauling, producer and engineer of 5 Seconds of Summer's album posted a photo of him on Instagram with the London Symphony Orchestra in the background. "Live strings with the London Symphony Orchestra for the new @5sos album. Absolutely breathtaking," he said. Calum Hood, bass guitar and vocals, also shared a photo same as Pauling's and wrote "Got to watch an orchestra play strings on songs I've written on for album 2. Today was a good day."

According to Luke Hemmings, the lead singer and guitarist of the Aussie band, their album is about to finish already. "We've written the whole record as far as we know. It's basically all recorded almost, there's a few more things to do and then we'll put it out, put a single out. You know how it works - single, single, album," Hemmings said.

This pop punk band is really one of the successful bands in the world, as tickets in their tours are always sold out. Like their recent tour in Belfast, Northern Island, they rocked the arena, almost sending the crowd screaming time after time.

Their opening act was Hey Violet, an American rock band based in Los Angeles. According to Belfast Live, the Belfast audience "ate it up."

As for the main act which is of course 5 Seconds of Summer, the crowd drowned the arena with scream from all over the place. Their single "Don't Stop" had the most reacted song, though fans knew every word as the band kept on performing.

Now that they are so famous, members of the band couldn't just believe what is happening. "We've been touring for like three years. We get the opportunity to travel the world, we've just started our arena tour and we just finished Europe. It's pretty unbelievable and I guess we just never thought we could make it to this point. But it's damn cool that we have, and we just keep looking forward to the future," Michael Clifford said.