U2 formed at Mount Temple Comprehensive School when the members were teenagers with limited musical proficiency. Within four years, they signed with Island Records and released their debut album Boy. 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 breakthrough 1987 album The Joshua Tree, which, according to Rolling Stone, elevated the band's stature "from heroes to superstars". Reacting to musical stagnation and late-1980s criticism of their earnest image and musical direction, the group reinvented themselves with their 1991 hit album Achtung Baby and the accompanying Zoo TV Tour. U2 integrated dance, industrial, and alternative rock influences into their sound and performances, and embraced a more ironic and self-deprecating image. Similar experimentation continued for the remainder of the 1990s with mixed levels of success. U2 regained critical and commercial favour after their 2000 record All That You Can't Leave Behind. On it and the group's subsequent releases, they adopted a more conventional sound while maintaining influences from their earlier musical explorations.
U2 have released 12 studio albums and are among the all-time best-selling music artists, having sold more than 150 million records worldwide. They have won 22 Grammy Awards, more than any other band, and in 2005, they were inducted into the Rock and Roll Hall of Fame in their first year of eligibility. Rolling Stone ranked U2 at number 22 in its list of the "100 Greatest Artists of All Time". Throughout their career, as a band and as individuals, they have campaigned for human rights and philanthropic causes, including Amnesty International, the ONE/DATA campaigns, Product Red, and The Edge's Music Rising.
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