2000-03: All Rise, One Love and Name Dispute
The band released their debut single "All Rise" in May 2001 and it reached number 4 on the UK Singles Chart. Their follow up single "Too Close" was released in August 2001 peaking at #1 on the UK Singles Chart. They went on to achieve a second number one in November with "If You Come Back". The album All Rise was released in time for Christmas and reached number one, eventually selling in excess of 1.8 million albums in the UK. The final single from the album, "Fly By II", reached number six in March 2002. Their second studio album, One Love was released in October 2002, entering at #1 on the UK Albums Chart and selling more than 150,000 copies. Three singles were released from the album: "One Love", which peaked at #3, "Sorry Seems to Be the Hardest Word", featuring vocals from Elton John, which peaked at #1, and "U Make Me Wanna", which peaked at #4. The song "Supersexual" was issued in parts of South America and Spain in order to promote the band in the region. In June 2003, Hugh and David Nicholson of 1970s Scottish band Blue took Blue to court. The case was a high profile High Court case, and the reason for the court case was due to the fact that both bands had the same name. Both bands came to a conclusion they could still use their names commercially and be known as their names.
2003-05: Guilty, Best of Blue and Split
Their third studio album, Guilty, was released in the fall of 2003, entering at #2 on the UK Albums Chart and selling 100,000 copies on the week of release. The album spawned four singles, including the title track, "Guilty", which peaked at #2, "Signed, Sealed, Delivered, I'm Yours", featuring vocal from Stevie Wonder and Angie Stone, which peaked at #11, "Breathe Easy", which peaked at #4, and "Bubblin'", which peaked at #9. The album ended up selling more than 1 million copies in the UK alone. The song "The Gift" was released to promote the album in Japan. The band made the decision to split in 2004 after Elton John publicly suggested that their popularity was decreasing and that they should concentrate on making solo careers. As such, Best of Blue, a greatest hits compilation, was released in November 2004. The album spawned the singles "Curtain Falls", which peaked at #4 in the UK, "Get Down on It" and "Only Words I Know", which peaked at #2 in France and Italy. The album peaked at #2 on the UK Albums Chart and was awarded a double platinum certification. Following the release of Best of Blue, band members Simon Webbe and Antony Costa made the decision to release an album compiling a selection of the group's b-sides, remixes and previously unreleased material. The album also includes three tracks only previously in Japan: "The Gift", "It's Alright" and "Elements". The album also includes band member Duncan James' debut solo single, "I Believe My Heart". By the indication of the album booklet, a live version of "Lonely This Christmas" from CD:UK was intended to be track seven on the album, however, was removed from the tracklisting for unknown reasons. The album was released in July 2005, becoming available in several European countries, as well as Japan, Thailand and China, however, was a commercial failure and failed to chart anywhere. The album was not released in the UK, despite copies being widely available.
2009-11: Reunion and Eurovision Song Contest
In April 2009, it was revealed that Blue had reformed and had written new material, due to be released in a joint partnership with Innocent Records and EMI Music, with whom they still have a three-record deal. The band confirmed that they would be performing at 95.8 Capital FM's Summertime Ball, which took place in London's Emirates Stadium in June 2009. Following the performance, the band agreed to perform at the Silverstone Classic festival in August 2009. It was announced on 29 January 2011 that Blue would reunite and also represent the United Kingdom in the Eurovision Song Contest 2011, with their entry "I Can". It coincided with the tenth anniversary of the establishment of the band in 2001 and a one hour documentary was broadcast in April 2011 celebrated their preparations for the final. It was the third time the group has Eurovision ambitions as group member Lee Ryan wrote and composed "Guardian Angel", Andy Scott-Lee's song for the 2005 edition of Making Your Mind Up. Furthermore, Antony Costa came second in the 2006 edition of the show with the song "It's A Beautiful Thing". Group member Duncan James was a panellist on all episodes of the Eurovision: Your Country Needs You series in 2009, which Jade Ewen won. He also announced the UK votes in the Eurovision Song Contest 2009 final. Blue became the first UK representatives since The Shadows in 1975 to have had multiple no.1 singles in the UK chart prior to appearing in Eurovision, and the first since Sonia in 1993 to have had a no.1 at all before entering the competition. The song "I Can" premiered on 11 March 2011, on The Graham Norton Show. In the contest, they came 11th with 100 points. After the contest Blue said they were the victims of political voting, claiming they would have finished higher if countries had voted for the performance rather than their neighbours. It later turned out when the European Broadcasting Union (who runs Eurovision) released the split Televote & Jury results, That Blue came in 5th place with the European voters and the final result was down to coming in 22nd place on the Jury vote. Duncan James insisted that the result of their Eurovision bid won't affect their UK comeback, adding: "Should the worst happen, we're still going to press ahead with the album. It won't be the last of us – we're all fully committed to this band again."
The band began recording new material in July 2010. They revealed during in an interview in March 2011 that they had recorded a collaboration with American R&B superstar Bruno Mars for their upcoming, fourth studio album. Discussing the record with Digital Spy, Lee Ryan said: "We've been writing with Ne-Yo, and I've written at least a couple of songs on my own that will probably make the album. We've also been working with Bruno Mars on a song called 'Black And Blue' – he's sending his parts over from a demo we recorded a while ago. It's got some haunting notes on the chorus." They also revealed that three tracks on the album had been produced by RedOne, and that they felt that the material was "their best work to date". During February 2012, the band embarked on a small tour across Manila, performing with fellow boyband A1 and Jeff Timmons in three special concerts, two of which included the Smart Araneta Coliseum on 25 February 2012, and the Singapore Indoor Stadium on 28 February. The tour was billed as "Boybands: The Greatest Hits Tour".
On 22 June 2012, the band premiered their new single, "Hurt Lovers", during a concert in China. In an interview shortly after the concert, the band claimed that "Hurt Lovers" was one of the first tracks they recorded after re-uniting, and that it was an obvious choice for their comeback single. The track was co-written by the band, along with Jez Ashurst, David Jost, Martin Schmidt and Alexander Zuckowski. It received positive reception across Asia, before being officially premiered in Germany on 6 October 2012. Thus, the creators of the film Schluss Macher approached the band, and asked if the song could be used as the official theme for the film. Thus, the track will receive an early release in Germany on 4 January 2013, before being released across the world later in the year. In promotion of the single, the band performed it live on Vocea României on 4 December 2012, as well as embarking on an acoustic radio tour across six cities in Germany.
In October 2012, the group confirmed via their official Facebook page that the title of their fourth studio album would be Roulette. It was also revealed that the album will receive an early release in Germany, being made available from 25 January 2013. The band shot the album's artwork in a deserted casino in November 2012.