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Ut originated from New York City's downtown no wave scene, forming in December 1978. The inheritors of the fertile collision between rock, free jazz, and the avant-garde that first manifested itself in the Velvet Underground, Ut soon became a serious force within the New York music scene.

Uh Huh Her is an indie/rock/electropop band that was formed in January 2007. The band's name came from an album by artist PJ Harvey, titled Uh Huh Her. The band has mentioned several times changing their name to UHH (pronunciation "U-H-H"), as opposed to the full "Uh Huh Her". They believe the original name looks good in written form, but is awkward to pronounce. It is unclear at this time if the name change will be made official at any point.

Uncle Earl is an American old-time music group, formed in 2000 by KC Groves and Jo Serrapere. Currently the lineup consists of five women, all of whom share vocal duties: KC Groves, Kristin Andreassen, Stephanie Coleman, Paula Bradley, and Rachel Eddy. They have released three albums and two EPs, and their fifth album Waterloo, Tennessee was produced by John Paul Jones of Led Zeppelin. The group tours regularly, while many of the members also have separate solo careers.

Urban Symphony is an Estonian music group. It represented Estonia in the Eurovision Song Contest 2009 with the song "Rändajad", finishing in 6th place with 129 points. This is the best place for Estonia in the contest since 2002.

Upset are an American band formed in 2013. The band originally consisted of Ali Koehler on guitar and lead vocals, Jenn Prince on lead guitar and vocals, and Patty Schemel on drums. After the recording and release of their debut album She's Gone, Prince departed the band to work on other projects, with Lauren Freeman joining the band on lead guitar and Rachel Gagliardi on bass and vocals. Koehler is the former drummer of the bands Best Coast and Vivian Girls. Schemel rose to prominence as the drummer of Hole and currently also drums for the band Death Valley Girls. The band released their debut album on Don Giovanni Records on October 29, 2013.

U2 are an Irish rock band from Dublin. Formed in 1976, the group consists of Bono (vocals and rhythm guitar), the Edge (lead guitar, keyboards, and vocals), Adam Clayton (bass guitar), and Larry Mullen, Jr. (drums and percussion). U2's early sound was rooted in post-punk but eventually grew to incorporate influences from many genres of popular music. Throughout the group's musical pursuits, they have maintained a sound built on melodic instrumentals. Their lyrics, often embellished with spiritual imagery, focus on personal themes and sociopolitical concerns.

A British reggae and pop band formed in December 1978 in Birmingham, England. The band has had more than 50 singles in the UK Singles Chart, and has also achieved considerable international success.

Canadian alternative dance musical duo that began working out of Parkdale, a neighbourhood situated in the west end of Toronto, Ontario, Canada.

Ugly Casanova is an American indie rock band carried on Sub Pop Records. The band has released one album, Sharpen Your Teeth.

Ultra Vivid Scene was an American alternative rock band, started by Kurt Ralske.

Ultravox (formerly known as Ultravox!) are a British new wave band, formed in London in 1974 as Tiger Lily. Between 1980–86, they scored seven Top Ten albums and seventeen Top 40 singles in the UK, the most successful of which was their 1981 hit "Vienna".

Uncle Tupelo was an alternative country music group from Belleville, Illinois, active between 1987 and 1994. Jay Farrar, Jeff Tweedy, and Mike Heidorn formed the band after the lead singer of their previous band, The Primitives, left to attend college. The trio recorded three albums for Rockville Records, before signing with Sire Records and expanding to a five-piece. Shortly after the release of the band's major label debut album Anodyne, Farrar announced his decision to leave the band owing to a soured relationship with his co-songwriter Tweedy. Uncle Tupelo split on May 1, 1994, after completing a farewell tour. Following the breakup, Farrar formed Son Volt with Heidorn, while the remaining members continued as Wilco.

Underoath (stylized as Underøath or UnderOath) is an American Christian post-hardcore band from Tampa, Florida. Founded by Dallas Taylor and Luke Morton on November 30, 1997, in Ocala, Florida, subsequently its additional members were from Tampa, Florida.

Cooking Vinyl, Om Records, Junior Boy's Own, V2, Wax Trax!, Sire, Warner Bros.

The band became well known for its hit Rakkautta ja piikkilankaa in 2004. The band's lyrics are in the Finnish language.

Unrest is an indie rock band from the Washington, D.C. area. It was one of Mark Robinson's projects for what would eventually become the TeenBeat label, also created by Mark while in high school. Developing from an experimental approach of never playing the same song twice, earlier material seemed to be influenced by everything from punk to funk to Ennio Morricone. Original members Mark (guitar) and drummer Phil Krauth were joined by Bridget Cross on bass in 1990 and their sound evolved into a minimalist but lively kind of pop. The two full length albums released with this line up, 1992's Imperial f.f.r.r. and 1993's Perfect Teeth (distributed by the influential British label 4AD Records) featured finely crafted pop songs interspersed with strange avant-garde percussive and sonic tracks (sometimes featuring nothing but white noise, beeps or sirens). EPs released around the same time period reveal an even more pronounced gap between pop and experimental elements. The group broke up in 1994 with Phil pursuing a solo career and Mark and Bridget continued for a time as Air Miami, which released two singles and one album, me me me. Since Air Miami's demise in the mid '90s, Mark has continued to release various solo projects, as well as albums with his bands Cotton Candy and Flin Flon, and continues to run the TeenBeat label as well.

Unsane is an influential noise rock trio that formed in New York City in 1988. Their music also touches on elements of hardcore punk and metal. Writer Patrick Kennedy writes that "while developing the blueprint for noise-metal bands to follow, Unsane cut a remarkable swath through underground music, inspiring a devoted, cult-like following around the globe."

Unwritten Law is an American rock band formed in 1990 in Poway, California They have released seven full-length studio albums and have toured internationally, including performances on the Warped Tour. They are notable for their singles "Seein' Red" and "Save Me (Wake Up Call)," both of which entered the top 5 in the US Modern Rock charts. Their sixth studio album, Swan, was released March 29, 2011.

Urge Overkill is an alternative rock band, formed in Chicago, United States, consisting of Nathan Kaatrud, who took the stage name Nash Kato (vocals/guitar), and Eddie "King" Roeser (vocals/guitar/bass guitar). They are widely known for their song "Sister Havana" and their cover of Neil Diamond's "Girl, You'll Be a Woman Soon," which was notably used in Quentin Tarantino's Pulp Fiction. Their first album since 1995, Rock

Us Amongst The Rest is an English hard rock band from York, UK. The band has shared stages with Heaven's Basement and were at a show with members of Asking Alexandria in their hometown of York to perform a secret DJ set. Us Amongst The Rest are currently recording their debut studio album at Innersound Studios due for release on 7 July 2014. The name of the band derives from an ironic perception that all new bands sound the same.

Uverworld (stylized as UVERworld) is a Japanese rock band consisting of six members and originating from Kusatsu, Shiga. They have released eight studio albums and over twenty singles, most of them being successful. They have sold two million records worldwide.

U.P. Wilson (September 4, 1934 – September 22, 2004) was an African American electric blues guitarist and singer who performed Texas blues. He recorded five albums for JSP Records, the first being Boogie Boy! The Texas Guitar Tornado Returns!, and was known for playing a style of deep Southern soul blues that was gospel inflected.

Unico Wilhelm, Count van Wassenaer Obdam (30 October 1692 - 9 November 1766) was a Dutch nobleman who was a diplomat, composer, and administrator. He reorganized the Bailiwick of Utrecht of the Teutonic Order. His most important surviving compositions are the Concerti Armonici, which until 1980 had been misattributed to the Italian composer Giovanni Battista Pergolesi (1710-1736) and to Carlo Ricciotti (1681-1756).