 Inspired by the ethos of punk rock and its basic arrangements, the group began to write its own material.They eventually became one of the most successful acts in popular music, with albums such as 1987's "The Joshua Tree" and 1991's "Achtung Baby".Over the years, the Edge has experimented with various guitar effects and introduced influences from several genres of music into his own style, including American roots music, industrial music, and alternative rock.