We were caught together in this vicious loop that never came to an end: Luke Hemmings, the vocalist for 5 Seconds of Summer, has revealed the moment when the band came dangerously close to disbanding. vocalist and frontman for 5 Seconds of Summer Luke Hemmings, who is 22 years old, has said that his band almost disbanded after the success of their sophomore album, which was titled Sounds Good Feels Good.