Calum Hood is an Australian musician best known as the bassist and one of the vocalists for the globally successful pop rock band 5 Seconds of Summer. Born Calum Thomas Hood on February 25, 1996, he has played a pivotal role in shaping the sound and success of the band, which has become one of the most prominent musical exports from Australia since their formation in 2011. With their unique blend of pop and rock, 5 Seconds of Summer has captivated millions, selling over 10 million albums and more than two million concert tickets worldwide, while their songs have accumulated over seven billion streams.

Raised in Sydney, Calum Hood developed an early interest in music, influenced by diverse genres and artists. He initially showed a talent for singing and playing the guitar, which later evolved into his role as a bassist. In high school, he formed a band with his friends, including fellow band members [c:Luke Hemmings], [c:Michael Clifford], and [c:Ashton Irwin]. Their early performances garnered attention, and they eventually caught the eye of music industry executives, leading to their signing with a record label.

5 Seconds of Summer gained international fame when they toured with [c:One Direction] in 2013, which significantly broadened their audience. The band's self-titled debut album, released in 2014, included hit singles such as "She Looks So Perfect" and "Amnesia," propelling them into the spotlight. The album's success marked the beginning of a series of achievements, including nominations and wins at prestigious award shows such as the American Music Awards and the MTV Europe Music Awards.

Throughout their career, Calum Hood and his bandmates have consistently pushed musical boundaries, experimenting with various styles while maintaining their pop-rock roots. Their discography includes multiple chart-topping albums, with works like "Sounds Good Feels Good" and "Youngblood" showcasing their growth as artists. The latter produced hit singles like "Want You Back" and "Youngblood," further solidifying their place in contemporary music.

In June 2025, Calum made a significant step in his career by releasing his debut solo album, showcasing a different facet of his musical abilities. The album has been well-received, allowing him to express his personal artistry outside the band dynamics. As 5 Seconds of Summer continues to tour and create music, Calum Hood remains a dynamic figure in the music industry, known not only for his contributions to the band but also for his individual artistry and impact on pop music.