According to what theOxford English Dictionarycalls "a late tradition" (first recorded in 1726), the plant was used bySaint Patrickto illustrate theChristiandoctrine of theTrinity. However, the posthumous timing of this legend (coming some 1,200 years after his death), and the lack of supporting evidence found in St. Patrick's writings have caused some to question its authenticity.In the pre-Christian era Celtic moon cult the shamrock symbolised the three phases of the moon
U2are anIrishrockband fromDublin. Formed in 1976, the group consists ofBono(vocals and guitar),The Edge(guitar, keyboards and vocals),Adam Clayton(bass guitar), andLarry Mullen, Jr.(drums and percussion). U2's early sound was indebted topost-punkbut eventually grew to incorporate influences from many genres ofpopular music. Throughout the group's musical pursuits, they have maintained a recognisable sound built on melodic instrumentals, highlighted by The Edge'stexturalguitar playing and Bono's expressive vocals. Their lyrics, often embellished with spiritual imagery, focus on personal themes and sociopolitical concerns.
U2 formed atMount Temple Comprehensive Schoolwhen the members were teenagers with limited musical proficiency. Within four years, they signed toIsland Recordsand released their debut albumBoy. By the mid-1980s, they became a top international act. They were more successful as live performers than they were at selling records, until their 1987 breakthrough albumThe Joshua Tree,which, according toRolling Stone, elevated the band's stature "from heroes to superstars".Reacting to a sense of musical stagnation and a late-1980s critical backlash against their earnest image and musical direction, the group reinvented themselves with their 1991 hit albumAchtung Babyand the accompanyingZoo TV Tour. U2 integrateddance,industrial, andalternative rockinfluences into their sound and performances, and embraced a more ironic and self-deprecating image. Similar experimentation continued for the remainder of the 1990s with reduced levels of success. U2 regained critical and commercial favour after their 2000 recordAll That You Can't Leave Behind. On it and the group's subsequent releases, they pursued a more conventional sound while maintaining influences from their earlier musical explorations.