MX is a Brazilian thrash metal band, formed in the early 1980s in São Paulo. Its name comes from the American ICBM MX missile. Mx was one of the most important bands from the Brazilian thrash metal scene during the late 1980s. The band's sound is closer to the Bay Area thrash scene than the Brazilian scene, although many of the vocals were death metal grunts. However, some of its later work was fitting as post thrash. MX was the opening act in Brazil for Testament in 1989 and Exodus in 1997.