Blue is a British boy band formed in London in 2000, consisting of members Antony Costa, Duncan James, Lee Ryan, and Simon Webbe. Their musical style is primarily pop and R&B, featuring harmonious vocals and catchy, melodic hooks. Blue made an impact on the music scene with their debut album "All Rise" (2001), which topped UK charts and went multi-platinum. Their significance lies in their ability to achieve substantial commercial success both domestically and internationally during the early 2000s resurgence of boy bands.