No Doubt is an American rock band from Anaheim, California that formed in 1986. The ska-pop sound of their first album, No Doubt, failed to make waves. The band's diamond-certified album Tragic Kingdom helped to launch the ska revival of the 1990s, and "Don't Speak", the third single from the album, set a record when it spent sixteen weeks at the number one spot on the Billboard Hot 100 Airplay chart.

Following this the group released its next album, Return of Saturn, four years later. While a minor success commercially it could not match the success of their previous album and underperformed both commercially and critically. Fifteen months later, the band reappeared with Rock Steady, which incorporated reggae and dancehall music into their work. The album was primarily recorded in Jamaica and featured collaborations with Jamaican artists Bounty Killer, Sly and Robbie, and Lady Saw. The album produced two Grammy-winning singles, "Hey Baby" and "Underneath It All".

No Doubt released the compilation The Singles 1992–2003 and box set Boom Box in 2003, both of which contained a cover version of the Talk Talk synthpop song "It's My Life". Frontwoman Gwen Stefani launched her solo career the next year with several collaborations, including bandmate Tony Kanal as well as Pharrell Williams of The Neptunes, while guitarist Tom Dumont began his side project, Invincible Overlord. During its career, the band has won two Grammy Awards and sold 28 million records worldwide to date. The band embarked on a US national tour throughout the summer of 2009. No Doubt was ranked 89th best artist of the decade by Billboard.

Eric Stefani and his sister Gwen formed a band called Apple Core in 1986. Eric taught himself to play accordion and played for the band with Gwen singing back up.

About a year later Eric met John Spence at a Dairy Queen and had talked about getting a group together to play music. Eric got a keyboard and gathered some players together to practice. The practice included Eric Stefani (keyboards), Gwen Stefani (vocals), John Spence (Vocals), Jerry McMahon (Guitar), Chris Leal (Bass) and Gabe Gonzalas (Trumpet), Alan and Tony Meade. They practiced in Eric's parents' garage.

Tony Kanal went to one of the band's early shows and soon joined the band as its bassist. After initially rejecting her advances, he began dating Gwen, but they kept their relationship secret for a year, feeling that it was an unspoken rule that nobody date her.

In December 1987, Spence committed suicide several days before the band was to play a gig at The Roxy Theatre for record industry employees. No Doubt disbanded but decided to regroup after several weeks with Alan Meade taking over vocals. When Meade left the band, Gwen replaced him as lead singer, and No Doubt continued to develop a live following in California. In early 1988, Tom Dumont left Rising, a heavy metal band of which he was a member with his sister, stating that local metal bands "were into drinking, wearing Spandex" but that he wanted to focus on music. He joined No Doubt and replaced Jerry McMahon as the band's guitarist, adding a distinct metal influence to its sound. Adrian Young replaced Chris Webb as the drummer the following year.

Before the release of the video "Just a Girl" on MTV and other outlets the band performed shows in Disneyland for Grad Night in 1995 where they put on a remarkable showing. Gwen would wear the same outfit as in the Tragic Kingdom CD cover. The release of 1995's Tragic Kingdom and the single "Just a Girl" allowed the group to achieve mainstream commercial success. No Doubt began touring in support of the album late that year, and it grew into a 27-month international tour. In 1996, the second single, "Spiderwebs", was successful, and "Don't Speak", a ballad written about Stefani and Kanal's break-up, was released as the third single and broke the previous record when it topped the Billboard Hot 100 Airplay for sixteen weeks. No Doubt was nominated for two Grammy Awards for Best New Artist and Best Rock Album at the 1997 Grammy Awards. By the end of the year, half of the songs on Tragic Kingdom had been released as singles, and the album was certified eight times platinum. Later, they were nominated for two more Grammys for Song of the Year and Best Pop Performance by a Duo or Group with Vocal, both for "Don't Speak". The Recording Industry Association of America certified the album diamond in February 1999, and with worldwide sales of sixteen million, it is one of the best-selling albums in history. The band's self-titled debut album began selling copies again off of the success of Tragic Kingdom and reached total sales of over a quarter of a million copies.

In 2000, the band released Return of Saturn, its follow-up to Tragic Kingdom. The album featured a darker tone and was more lyrically advanced than No Doubt's previous work. The main lyrical focus of the new record had shifted from Gwen Stefani's relationship with bassist Tony Kanal to her new relationship with Gavin Rossdale. Return of Saturn was critically acclaimed, but was not as commercially successful as their previous album, and the lead single, "Ex-Girlfriend", failed to chart on the Billboard Hot 100 in the United States. Also released as singles from the album were the tracks "Simple Kind of Life" and "Bathwater".

After Return of Saturn, the band returned to recording in January 2001. During this time, it contributed a cover version of Donna Summer's "Love to Love You Baby" for the Zoolander soundtrack and recorded a song with Kelis for her album Wanderland. Stefani made high-profile appearances on Moby's "South Side" and Eve's "Let Me Blow Ya Mind". These appearances lent No Doubt credibility and an opportunity to explore new genres. Highly influenced by Jamaican dancehall music and recorded primarily in Jamaica, the band's 2001 studio album, Rock Steady, produced two hit Grammy-winning singles, "Hey Baby", which featured Bounty Killer, and "Underneath It All", which featured the first lady of dancehall, Lady Saw. Both singles managed to reach the top five on the Billboard Hot 100. The album also released "Hella Good" and "Running" as singles. In addition, pop-star Prince co-wrote, produced, and performed on "Waiting Room" from Rock Steady. Stefani had previously provided vocals for a song on Prince's Rave Un2 the Joy Fantastic album, "So Far, So Pleased". In November 2002, No Doubt made an appearance in the Dawson's Creek episode "Spiderwebs".

Lead singer Gwen Stefani began work on her 1980s-inspired New Wave and dance-pop side project in 2003, which eventually evolved into the full-fledged solo album, Love. Angel. Music. Baby., released on November 23, 2004. The album reached multi-platinum status in several countries, including a quintuple platinum certification in Canada and triple platinum in the U.S. Stefani launched her first solo arena tour in October 2005, which coincided with the news of her pregnancy (her son, Kingston James McGregor Rossdale, was born on May 26, 2006). She released her second solo dance-pop album, The Sweet Escape in December 2006.

In early 2005, Tom Dumont released his own solo music project, Invincible Overlord, with friend and collaborator Ted Matson, and backed up Matt Costa on his 2005 tour. Adrian Young, the band's drummer, did the drums for Bow Wow Wow's 2004 tour and many of the tracks on Unwritten Law's 2005 release, Here's to the Mourning, as well as featuring on several shows in 2006 for TheStart. Young will also be playing on Rockstar: Supernova runner-up Dilana's upcoming album.

In 2008, Tony Kanal collaborated with pop/rock artist P!nk on the album Funhouse. Kanal co-produced "Sober", co-wrote "Funhouse" and also sang back-up vocals on "Crystal Ball".

With Stefani promoting her second solo album, No Doubt began initial work on a new album without her and planned to complete it after Stefani's tour was finished. In March 2008, the band started making posts concerning the progression of the album on their official fan forum. Stefani made a post on March 28, 2008 stating that songwriting had commenced but was slow on her end because she was, at the time, pregnant with her second child.