5 Seconds of Summer @ HCA July 24New look. Australian rockers 5 Seconds of Summer have just announced a new world tour, kicking off in March, heading to the US in May, and stopping at Hollywood Casino Amphitheater outside St. Louis on July 24, 2023. The band has already released 2 new songs, “NOT OK” and “Boyband” featuring a new future punk sound. Formed in Sydney, Australia in 2011, 5 Seconds of Summer have grown from local high school friends into one of the biggest bands of the 21st century. Pre-order “Everyone’s A Star” here.