text: Bands such as Crimson Glory , Fates Warning , QueensrÃ che , and Dream Theater took elements of progressive rock groups ( primarily the instrumentation and compositional structure of songs ) and merged them with heavy metal styles associated with bands like Judas Priest and Black Sabbath ( the former of which had some progressive influences on their early albums ) . The result could be described as a progressive rock mentality with heavy metal sounds .
simplified: Bands such as QueensrÃ che and Dream Theater took certain things about progressive rock groups and mixed them with heavy metal styles .