JLS are an English boy band consisting of members Aston Merrygold, Oritsé Williams, Marvin Humes, and JB Gill, originally formed by Williams. They initially signed to Tracklacers production company New Track City and then went on to become runners-up of the fifth series of the ITV reality talent show The X Factor in 2008, coming second to Alexandra Burke. Following their appearance on The X Factor, JLS signed to Epic Records. Their first two singles "Beat Again" and "Everybody in Love" both went to number one on the UK Singles Chart.

A boy band is loosely defined as a vocal group consisting of young male singers, usually in their teenage years or in their twenties at the time of formation. Generally, boy bands perform love songs marketed towards girls and young women. Many boy bands dance as well as sing, usually giving highly choreographed performances. South Korean boy bands usually also have designated rappers.