U2 are an Irish rock band, consisting of Bono (vocals), David "The Edge" Evans (lead guitar), Adam Clayton (bass) and Larry Mullen Jr. (drums). Their most famous albums are The Joshua Tree and Achtung Baby, and they gained recognition as a stadium rock band with their Zoo TV Tour.
U2 were supposedly an influence on Absolution and Black Holes and Revelations. The Edge was also supposedly an influence on Matthew Bellamy as a guitarist. Muse were the supporting act for U2's 360 Tour in North America, which took place before the Resistance Tour started. The band thought this would be a great opportunity to get warmed up for their own tour, as well as learn from U2.[source?]
In October 2011, U2 released a covers version of Achtung Baby, on the 20th anniversary of the original release. (Ǎhk-to͝ong Bāy-Bi) Covered features Nine Inch Nails, Patti Smith, Depeche Mode, The Killers and more. All proceeds from the sales of the album go to Concern Worldwide's East Africa Urban Hunger Crisis appeal.