One of the most influential Doom acts from the 80s playing an unique mix of old school doom-metal and psychedelic rock with clean vocals combining the lumbering heaviness of Black Sabbath and the dual guitars of Judas Priest. The group was formed in 1979 in the outskirts of Chicago, IL by vocalist Eric Wagner, guitarists Bruce Franklin and Rick Wartell, bassist Ian Brown, and drummer Jeff "Oly" Olson. Throughout their history, Franklin and Wartell have remained the only constants in the band. The band's first two albums are characterized by their lumbering tempos, heavy guitars, and Christian lyrics (which, Wagner would later state were written more as a reaction to the rising tide of satanic metal bands in the early '80s as opposed to an attempt at preaching) and are considered classics in many doom metal quarters. By the 1990s, the band traded in the doom and Christianity for a more psychedelic/stoner metal sound. By the end of the '90s, Wagner had left the group and the band sat on the backburner as members focused on other projects. In the early/mid 2000s, Franklin, Wagner, Wartell, and Olson re-grouped and eventually released 2007's "Simple Mind Condition". Afterwards, the band fractured again, with Wagner and Olson eventually leaving and Wartell and Franklin continuing with different line ups. In 2013, Trouble released "The Distortion Field" with vocalist Kyle Thomas, who had previously replaced Wagner from 1997 to 2000. In 2012, Wagner, Olson, and former bassist Ron Holzner (who played bass in Trouble from 1986 until 2002) formed The Skull, who were initially set to pay tribute to Trouble's older, doom material but eventually opted to write original music.