 The music typically showcases the extreme technical proficiency of the performers, and usually uses unorthodox harmonies as well as complex rhythms with frequent meter changes and intense syncopation.While the genre emerged towards the late-1980s, it was not until the 1990s that progressive metal achieved widespread success.Queensrÿche, Dream Theater, Tool, Symphony X, Shadow Gallery, King's X, and Fates Warning are a few examples of progressive metal bands who achieved commercial success.