The Irish rock group U2 is known for its anthemic guitar sound, its political and spiritual themes, and its live presence. Vocalist Bono Vox (Paul Hewson), guitarist The Edge (David Evans), bass guitarist Adam Clayton, and drummer Larry Mullen formed U2 in 1977 and began playing live dates in Dublin rock clubs. In 1980 they recorded their debut album, Boy, which won accolades for The Edge's distinctive ringing guitar sound. October (1981) and War (1983) brought the band fame in Ireland and England, and with their epic 1984 album The Unforgettable Fire they became stars in the United States. The Joshua Tree (1987) featured their first American number-one hit, "With or Without You," and brought them several Grammy Awards. Rattle and Hum (1988), accompanied by a concert film of the same name, was derided as self-indulgent. With Achtung Baby (1991) and Zooropa (1993), U2 sought to reestablish their credibility with a harsher sound.