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Suicidal Tendencies (also referred to as S.T. or simply Suicidal) are an American crossover thrash band founded in 1980 in Venice, California by vocalist Mike Muir, who is the only remaining original member of the band. Along with D.R.I., Corrosion of Conformity, and S.O.D., they are often credited as one of "the fathers of crossover thrash". Their current lineup includes Muir, guitarists Dean Pleasants and Jeff Pogan, bassist Ra Diaz and drummer Dave Lombardo. Notable former members of the band are lead guitarist Rocky George (now in Fishbone), rhythm guitarist Mike Clark (formerly of No Mercy, now in Waking the Dead), bassists Louiche Mayorga (now in Luicidal), Robert Trujillo (formerly or later of Infectious Grooves and Ozzy Osbourne, now in Metallica), Josh Paul (now in Daughtry) and Stephen "Thundercat" Bruner, and drummers Amery Smith (later of Uncle Slam and the Beastie Boys), Jimmy DeGrasso (formerly or later of Y&T, White Lion, Alice Cooper and Megadeth, now in Ratt), Brooks Wackerman (formerly or later of Infectious Grooves, Bad Religion and Tenacious D, now in Avenged Sevenfold) and David Hidalgo Jr. (now in Social Distortion and The Bronx).

Wackerman (who had just joined Bad Religion) had left Suicidal Tendencies by 2001 while the band was on tour. Greg Saenz joined the band before Ron Bruner took over drum duties and Paul also left by the following year but was replaced by his brother Steve. The band toured during 2003 but were forced take another hiatus in 2004 due to Mike Muir requiring surgery for a back injury.  While the band failed to release an album with material, independently or otherwise, Suicidal Tendencies have continued to tour consistently since 2005. On October 29 of that year their live performance at the Grand Olympic Auditorium in Los Angeles was filmed. Suicidal Tendencies secured a spot in the metal/punk-rock Soundwave Festival in Australia in February and March 2007, taking in Brisbane, Sydney and Perth. They performed at the Artefact Festival in France on April 29, 2007, and performed in Istanbul, Turkey on May 29. They also headlined the Tuborg Stage at the Download Festival, held at Donington Park, UK on Friday June 8, 2007, and closed select shows for the Sounds of the Underground tour in San Jose, California on August 3, Irvine, California on August 4, and Mesa, Arizona on August 5. On August 1, 2008, Suicidal Tendencies headlined the Porao do Rock Festival in Brasilia in front of 15,000 people. By this stage Eric Moore had replaced Dave Hidalgo on drums. During the fall of 2008, the band toured with Whole Wheat Bread, Madball, Terror, and Death by Stereo, opening select dates. During this tour Year of the Cycos - a compilation album featuring Suicidal Tendencies, Infectious Grooves, Cyco Miko and No Mercy - was available for the first time for purchase exclusively at the concerts or from their official website. From the album, the original track "Come Alive" was released as a video clip, and is still their latest video clip to date. The band replaced As I Lay Dying on the first five shows of the No Fear Energy Music Tour with Lamb of God. Suicidal Tendencies toured Europe from June through July 2009.  The first-ever Suicidal Tendencies DVD Live at the Olympic Auditorium, featuring the full show recorded in Los Angeles back in 2005, was finally released on January 26, 2010 by Fontana Distribution via the band's own imprint, Suicidal Records. On the same day, a best of compilation was released as part of the Playlist music album series issued by Sony BMG.  In September 2010, Suicidal Tendencies released the album No Mercy Fool!/The Suicidal Family which consists of re-recordings of tracks from the Join the Army album and of old No Mercy songs, plus the previously released "Come Alive". In support of the album the band toured the US in October and November, including performing at Tucson, Arizona KFMA radio station's Fall Ball 2010 on October 24 at Pima County Fairgrounds.
Suicidal Tendencies