Michael Allen Muir (born March 14, 1963) is an American singer who is the lead vocalist and the only sole continuous member of Los Angeles-based bands Suicidal Tendencies, Los Cycos, and Infectious Grooves. He has also released several solo albums under his nickname Cyco Miko. Muir's trademark is wearing bandanas, jerseys with the number 13, and hats with block-style letters that read "suicidal".
Born in Venice, Los Angeles, and raised in Santa Monica, Mike Muir is the younger brother of Jim Muir of the Dogtown skateboarding team. Jim exposed Mike to metal music as well as skateboarding. Muir attended Santa Monica College after being kicked out of school in the 10th grade.
Muir has cited bands such as the Sex Pistols, the Ramones, Black Sabbath, UFO, AC/DC, Van Halen, Emerson, Lake & Palmer, Led Zeppelin, and Kiss as his early musical influences, and has said that he was introduced to funk music by former bandmate Robert Trujillo. Muir incorporated funk influences into a few songs by Suicidal Tendencies and into his funk metal side project, Infectious Grooves.

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