The War Tour was a concert tour by the Irish rock band U2, which took place in 1982 and 1983 in support of the group's third album War. It was their first tour as full-time headlining acts.

The tour took place in Western Europe, the United States, and Japan, with new material from War taking an increasing role as the tour progressed. Venues were mostly halls, but some arenas were introduced later on. U2's performances were very well received both critically and commercially, especially in the United States where U2 broke through to became a major act. Scenes of lead singer Bono waving a white flag during the song "Sunday Bloody Sunday" became an emblematic image of this phase of U2's career.

The live album Under a Blood Red Sky and the concert film U2 Live at Red Rocks: Under a Blood Red Sky both originated from performances on the tour. The latter matched U2's concert fervour with the spectacular natural setting of the Red Rocks Amphitheatre in the rain to produce a memorable document of the War Tour and to further increase the group's popularity; U2's filming of the Red Rocks show was later selected by Rolling Stone magazine as one of the "50 Moments that Changed the History of Rock and Roll".

War is an organized, armed, and often a prolonged conflict that is carried on between states, nations, or other parties typified by extreme aggression, social disruption, and usually high mortality. War should be understood as an actual, intentional and widespread armed conflict between political communities, and therefore is defined as a form of political violence. The set of techniques used by a group to carry out war is known as warfare. An absence of war (and other violence) is usually called peace.

In 2003, Nobel Laureate Richard E. Smalley identified war as the sixth (of ten) biggest problems facing the society of mankind for the next fifty years. In the 1832 treatise On War, Prussian military general and theoretician Carl von Clausewitz defined war as follows: "War is thus an act of force to compel our enemy to do our will."

While some scholars see warfare as an inescapable and integral aspect of human culture, others argue that it is only inevitable under certain socio-cultural or ecological circumstances. Some scholars argue that the practice of war is not linked to any single type of political organization or society. Rather, as discussed by John Keegan in his History of Warfare, war is a universal phenomenon whose form and scope is defined by the society that wages it. Another argument suggests that since there are human societies in which warfare does not exist, humans may not be naturally disposed for warfare, which emerges under particular circumstances. The ever changing technologies and potentials of war extend along a historical continuum. At the one end lies the endemic warfare of the Paleolithic^{[citation needed]} with its stones and clubs, and the naturally limited loss of life associated with the use of such weapons. Found at the other end of this continuum is nuclear warfare, along with the recently developed possible outcome of its use, namely the potential risk of the complete extinction of the human species.

Joey Youngman, better known by his stage name Wolfgang Gartner, is a Grammy-nominated American house music producer and DJ. Much of his music prior to 2010 was released through his own record label, Kindergarten, but he signed with Ultra Records in 2010 and Ministry of Sound in the UK in 2011.

Youngman created the Wolfgang Gartner name in late 2008 after establishing a moderately successful name as a Deep House DJ. Not wanting to be criticized for such an abrupt departure in style, Youngman created the name anonymously. Gartner's identity was revealed officially in July 2008. Youngman took the name from the coach of the Cal Poly Mustangs men's soccer team. The Wolfgang Gartner logo was created in 2010 by New York graffiti artist Eric Haze who created logos for the Beastie Boys, Public Enemy and EPMD.

Gartner hosted the first episode of MTV's dance music show "Clubland" which aired on September 22, 2011. A portion of the episode was filmed at his home in Los Angeles, where he gave a tour of his studio and introduced music videos.