Their final product was a hip hop and pop record incorporating an array of genres, such as crunk, funk, reggae, Raï, calypso, soul, jazz and Latin rock.

Similarly to Elephunk, it explores lyrical themes such as relationship complexities, sexual attraction, partying, fame and, to a lesser extent, social issues.

The album was certified triple platinum by the Recording Industry Association of America (RIAA), selling over four million copies in the United States.

Internationally, it reached number one in Australia, Canada, France, Germany, Mexico, New Zealand and Switzerland, and has sold over nine million copies worldwide.

Despite its critical response, the album won two Grammy Awards for its singles "Don't Phunk with My Heart" and "My Humps", receiving three additional nominations.

"Don't Lie" peaked at number 14 on the Billboard Hot 100, being overshadowed by its successor "My Humps", which began receiving heavy unsolicited airplay.

[3] It peaked at number 14 on the US Billboard 200, was certified double platinum by the Recording Industry Association of America (RIAA), and garnered six Grammy Award nominations, including the group's first win for "Let's Get It Started".

[4] The commercial success of Elephunk made a substantial impact on the group's prominence, and its members will.i.am and Fergie planned on recording solo studio albums in 2004.

However, the plans were postponed as they "felt it was important to install the next Black Eyed Peas record this year with the momentum that we've had, which will only allow our solo adventures to be successful and continue to keep our franchise going".

On August 11, a fire caused by unattended candles broke out at the Glenwood Studios in Burbank, California while the group was recording, destroying approximately $50,000 worth of gear and instruments.

[7] In December, it was revealed the group had recorded "They Don't Want Music" with James Brown, and that Monkey Business was being mixed and neared completion.

[7] Monkey Business is a hip hop and pop album incorporating an array of genres, such as crunk, funk, reggae, Raï, calypso, soul, jazz and Latin rock.

[11][12][13][14][15][16] It opens with "Pump It", a hip hop-funk track heavily sampling Dick Dale's 1962 surf rock version of "Misirlou".

"[12] "My Style"–the group's second collaboration with Justin Timberlake–features "an ingenious mix of creative beats, subtle full-band backing, and multi-layered vocals".

[20] "Underground hip hop" track "Like That", featuring Q-Tip, Talib Kweli, CeeLo Green and John Legend, begins with a sample from Astrud Gilberto's 1965 version of "Who Can I Turn To?".

[23] The "funky" dance track "Bebot", whose title means "hot chick", is rapped entirely in Tagalog, much like "The Apl Song" from Elephunk (2003).

[23] "Audio Delite at Low Fidelity" lyrically details the group's history up until the release of Monkey Business, referencing their rise to prominence; it ends with the hidden track "Change".

[31][32] There, they commenced their promotional tour at the Brixton Academy in London on May 6, and performed at various venues and festivals across Europe and North America, including Wango Tango, until June 2.

[42] On March 21, an extended play (EP) titled Renegotiations: The Remixes was released, including alternative versions of seven non-single tracks from Monkey Business.

[47][48] In December 2004, MTV News reported "They Don't Want Music", featuring James Brown, would be released as the lead single from Monkey Business in February 2005.

[66] Its accompanying music video was directed by Fatima Robinson and Malik Sayeed, and shows Fergie dancing with backup dancers as images of expensive items such as Louis Vuitton purses and jewelry, which are supposed to have been bought for her by men, appear on the screen.

[51] Internationally, it reached the top ten in Australia, Belgium, Canada, Croatia, the Czech Republic, Greece, Hungary, Ireland, Italy, New Zealand, Switzerland and the United Kingdom, and on the European Hot 100 Singles.

[69][70][71][72][73] Its accompanying music video was directed by Francis Lawrence and features the group competing and fighting with a gang inside a parking garage.

[75] While it was never released as an official single, it was included on the Black Eyed Peas' extended play (EP) Renegotiations: The Remixes (2006), with its music video being an iTunes Store bonus track.

[77] Grammy Award-nominated "Gone Going" began receiving contemporary hit radio airplay in March 2006, which allowed it to peak at number 37 on the US Mainstream Top 40 despite not being released as a single.

Showcasing the Filipino culture, it features prominent Filipino-American artists and performers, including American Idol's third season third-place finalist Jasmine Trias.

[13] Betty Clarke from The Guardian commended the Black Eyed Peas' use of the "good-guy rap plus pop-profundity multiplied by numerous special guests" formula but dismissed the lyrical themes.

[130] It also debuted at number one in France, Germany and Switzerland, while reaching the top ten in Austria, Belgium, Denmark, Finland, Greece, Hungary, Ireland, Italy, the Netherlands, Portugal and Spain.

[137] The album has also been certified triple platinum by the British Phonographic Industry (BPI), selling over a million copies in the country by June 2009, according to Music Week.

Club stated: "With Elephunk, The Black Eyed Peas made the rare leap from underrated and overlooked to obnoxiously (and undeservedly) overexposed.