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“Complete Mess” follows 5 Seconds of Summer anniversary single “2011” and is the lead single of their fifth studio album, 5SOS5. An informal announcement of the song was made on February 18th 2022, when the band sent a magazine to a fan and retweeted a tweet she made about the song’s title and release date. However, the official announcement was made via via Instagram post a week later, on February 25th, alongside the official cover art of the song. Read more on Last.fm.

5 Seconds of Summer (also known as 5SOS) are a 4-piece Australian pop rock/pop punk band. Formed in Sydney, New South Wales, Australia in 2011, the band consists of Luke Hemmings (lead vocals, guitar), Michael Clifford (guitar, vocals), Calum Hood (bass guitar, vocals) and Ashton Irwin (drums, vocals). The group were originally YouTube celebrities, posting videos of themselves covering songs from various artists in 2011. From there, they gained a small following, and rose to international fame when One Direction invited them on their Take Me Home Tour in 2013. In February 2014, they released "She Looks So Perfect" as their debut worldwide single. It topped the charts in Australia, New Zealand, Ireland and the United Kingdom. Their self-titled debut studio album was released in June 2014, which peaked #1 in 11 countries. Read more on Last.fm. User-contributed text is available under the Creative Commons By-SA License; additional terms may apply.