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O-Town, also known as OTWN or OTOWN, is an American boy band formed from the first season of the reality TV series Making the Band in 2000. As of 2015, the group includes Erik-Michael Estrada, Trevor Penick, Jacob Underwood, and Dan Miller. Originally managed by Lou Pearlman, the group disbanded in 2003 after releasing two albums.

O.A.R. (Of A Revolution) is a rock band that originated in 1996 in Rockville, Maryland. Comprising lead vocalist/guitarist Marc Roberge, drummer Chris Culos, guitarist Richard On, bassist Benj Gershman, and saxophonist/guitarist Jerry DePizzo, the band is recognized for dynamic live performances and extensive summer tours. Their music blends various genres and carries a positive, inspiring vibe.

O.T. Genasis, born on June 18, 1987, in Atlanta, grew up in Long Beach with influences from artists like Cutty Ranks, Buju Banton, and 50 Cent. Signed to G-Unit Records in 2011, he released his debut mixtape in 2012. Later signed to Busta Rhymes' Conglomerate Records, he gained recognition with hits like "CoCo," reaching number 20 on the Billboard Hot 100. Beyoncé featured his song "Everybody Mad" in her Coachella 2018 performance and On the Run II Tour with Jay-Z.

Benedict Chiajulam Ihesiba Jr., born on April 23, 1992, is an American rapper widely recognized as OG Maco from College Park, Georgia. His breakout came with the 2014 hit "U Guessed It," reaching number 90 on the Billboard Hot 100. Signed to Quality Control Music in 2014, the label later joined Motown and Capitol Records in 2015. OG Maco was selected for XXL magazine's prestigious 2015 Freshman Class.

OK Go, formed in 1998, is an American rock band now based in Los Angeles. The lineup includes Damian Kulash, Tim Nordwind, Dan Konopka, and Andy Ross (joined in 2005). Known for elaborate, single-take music videos, their Grammy-winning "Here It Goes Again" marked a highlight in their quirky and innovative approach.

OMD (Orchestral Manoeuvres in the Dark), formed in 1978, is an English electronic band from Wirral, Merseyside. The founding duo, Andy McCluskey and Paul Humphreys, along with Martin Cooper and Stuart Kershaw, are electronic music pioneers. Their experimental yet pop-infused approach made them key figures in synth-pop, influencing the MTV-driven Second British Invasion in the United States during the 1980s.

Omar Samuel Pasley, known as OMI, born on September 3, 1986, in Clarendon, Jamaica, is a singer famous for his global hit "Cheerleader," remixed by German DJ Felix Jaehn. Signed to Ultra Music, a part of Sony Music, OMI released his debut album "Me 4 U" in 2015. Discovered by Clifton Dillon (Specialist) and initially signed to Oufah, OMI had local hits in Jamaica before gaining international acclaim with "Cheerleader."

Oasis, formed in Manchester in 1991, originated from the Rain. The core lineup included Liam Gallagher, Paul Arthurs, Paul McGuigan, and Tony McCarroll, with Noel Gallagher joining later. Signed to Creation Records, Oasis debuted with "Definitely Maybe" in 1994, the fastest-selling debut album in British history. Their second album, "(What's the Story) Morning Glory?" (1995), featuring new drummer Alan White, also achieved immense success. Throughout their existence, the Gallagher brothers remained the only stable members.

Icelandic indie folk/rock band Of Monsters and Men formed in 2010. The group, consisting of Nanna Bryndís Hilmarsdóttir, Ragnar "Raggi" Þórhallsson, Brynjar Leifsson, Arnar Rósenkranz Hilmarsson, and Kristján Páll Kristjánsson, won the Músíktilraunir in 2010. Their 2011 debut album, "My Head Is an Animal," topped charts globally, with the lead single "Little Talks" reaching international success. The band won the 2013 European Border Breakers Awards.

Nanna Øland Fabricius, born on May 2, 1985, is a Danish musician, singer, songwriter, and dancer known by her stage name Oh Land. Born in Copenhagen, she hails from a family with a musical background. Initially trained in ballet, her dancing career was cut short by injury, leading her to pursue music. Her debut album "Fauna" was released in Denmark in 2008, followed by her self-titled album in 2011, which marked her debut in the United States. The album peaked at number five on the Danish Albums Chart and introduced her to the American music scene, earning her the Brink of Fame: Music Artist award in 2011.

Oh Wonder, composed of Anthony Vander West (né West) and Josephine Vander West (née Vander Gucht), is a dynamic alt-pop duo that captivates global audiences with monthly single releases. Their success culminated in the self-titled debut (2015), followed by subsequent albums Ultralife (2017), No One Else Can Wear Your Crown (2020), and 22 Break (2021). These albums showcase their self-produced brilliance, defining their impactful journey.

Oh, Sleeper is an American metalcore band from Fort Worth, Texas that formed in 2006 with former members of Terminal. They've achieved significant milestones in their metalcore journey. They garnered attention with their debut album "When I Am God" in 2007, signing with Solid State Records. The band's resilience and musical prowess are evident in albums like "Son of the Morning" and "Children of Fire." Notably, they toured with heavyweights like Demon Hunter and Norma Jean, showcasing their powerful stage presence.