Original: Bands such as Fates Warning , Queensrÿche and Dream Theater took elements of these progressive rock groups -- primarily the instrumentation and compositional structure of songs -- and merged them with heavy metal styles associated with early Metallica , Megadeth and Iron Maiden .
Simplified: Bands such as Queensrÿche and Dream Theater took certain things about progressive rock groups and mixed them with heavy metal styles likes those of bands such as early Metallica and Megadeth .