who are the members?
Bono, the Edge, Adam Clayton and Larry Mullen Jr.
U2
Bono (lead vocals and rhythm guitar), the Edge (lead guitar, keyboards, and backing vocals), Adam Clayton (bass guitar), and Larry Mullen Jr. (drums and percussion). 
what is u2? It is an Irish rock band. when was it formed? 1976 who formed it? Larry Mullen Jr
wiki:5364868
U2 [SEP] Introduction
U2 are an Irish rock band from Dublin, formed in 1976. The group consists of Bono (lead vocals and rhythm guitar), the Edge (lead guitar, keyboards, and backing vocals), Adam Clayton (bass guitar), and Larry Mullen Jr. (drums and percussion). Initially rooted in post-punk, U2's musical style has evolved throughout their career, yet has maintained an anthemic quality built on Bono's expressive vocals and the Edge's effects-based guitar textures. Their lyrics, often embellished with spiritual imagery, focus on personal and sociopolitical themes. Popular for their live performances, the group have staged several ambitious and elaborate tours over their career. The band formed as teenagers while attending Mount Temple Comprehensive School, when they had limited musical proficiency.