The band formed in ‘76 when the band members were still teenagers with limited musical proficiency. By the mid-eighties, the group had already become a top international act. The band was noted for its anthemic sound, the lead singer’s impassioned vocals, and a toned rhythm section. The band’s 1987 record, entitled The Joshua Tree, brought them mega-stardom. Their ‘91 release Achtung Baby and the Zoo TV Tour were part of a significant reinvention for U2