U2 are a rock band formed in Dublin,
Ireland. The band consists of Bono
(vocals and guitar), The Edge (guitar,
keyboards, and vocals), Adam Clayton
(bass guitar), and Larry Mullen, Jr.
(drums and percussion). The band
formed in 1976 when the members were
teenagers with limited musical
proficiency. By the mid-1980s, the band
had become a top international act. Their
success as a live act was greater than
their success as a record selling act until
their 1987 album The Joshua Tree, which,
according to Rolling Stone, elevated the
band's stature "from heroes to
superstars". U2 responded to the dance
and alternative rock revolutions and their
own sense of musical stagnation by
reinventing themselves with their 1991
album Achtung Baby and the
accompanying Zoo TV Tour. Since 2000,
U2 have pursued a more conventional
rock sound that retains the influence of
their previous musical explorations. U2
have sold more than 145 million albums
worldwide and have won 22 Grammy
Awards, more than any other band. In
2005, the band were inducted into the
Rock and Roll Hall of Fame in their first
year of eligibility. Throughout their
career, as a band and as individuals, they
have campaigned for human rights and
social justice causes, including Amnesty
International, the ONE Campaign and
Bono's DATA (Debt, AIDS, Trade in Africa)