Calum Hood is an Australian musician best known as the bassist for the pop-rock band 5 Seconds of Summer. Born on January 25, 1996, in Sydney, he joined the band in 2011, which gained international fame for their catchy songs and energetic performances. In addition to his role as a bassist, Calum is also a vocalist and contributes to the band's songwriting. 5 Seconds of Summer has released several successful albums and singles, earning numerous awards and a dedicated fanbase worldwide.