Blue are a British boy band consisting of four members: Lee Ryan, Duncan James, Antony Costa, and Simon Webbe. The band debuted in 2001, and split up after much success, in 2005. All of the band members pursued solo singing careers alongside other interests. The band recently announced in April 2009 that they had reformed. Their only confirmed gig so far is Capital FM's Summer Ball in London.

The band released their debut single "All Rise" which sold more than 1.300.000 copies on May 21, 2001 and the song rose to number four on the British Top 40. Blue released their next single, "Too Close" (a cover version of Next's song), on August 27, 2001 and this song was Blue's first number one single. After the cd single Too Close there were two new singles from the album All Rise; If you Come Back and Fly By II (which is a remix of Fly By). Those singles sold more than 200.000 copies in the UK. The band released a new single and album, in the summer of 2002, both called "One Love" which was the best Blue album, selling more than 3.000.000 copies. Their next single, which also reached number one on the British Top 40, was a duet with Elton John entitled "Sorry Seems to be the Hardest Word", a cover version of one of John's songs. This track was number one in Europe for 6 weeks