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Progressive metal
Progressive metal is a fusion between progressive rock and heavy metal. It's one of heavy metal's most complex genres (along with other technical metal genres), due to its use of unusual and dynamic time signatures, long compositions, complex compositional structures, and virtuosic instrumental playing, where instrumental solos are detailed and extended. Vocals, if present, are melodic and lyrics are often philosophical, spiritual, and/or political. Forerunners in this genre include Tool, Dream Theater, Symphony X, Pain of Salvation, Fates Warning, Evergrey, Savatage, Opeth and Queensrÿche.
Speed metal
Speed metal is a sub-genre of heavy metal that uses traditional heavy metal song structures and riffing but with faster tempos and driving rhythms. It is usually just as melodic as traditional heavy metal. Speed metal emerged when traditional heavy metal bands started writing an occasional fast song. It kicked off as an established genre when bands wrote the majority of their songs in this style. It is considered an offshoot of power metal, and most bands in the genre are considered power metal.
Symphonic metal
Symphonic metal varies in form. It most commonly refers to bands that use orchestral elements in their music. These elements include full orchestras, opera themes, vocals or keyboarding akin to that of opera or symphony music, and a softer and more upbeat nature than other metal genres. The bands Nightwish, Within Temptation, and Epica fall under this sub-genre. Often, symphonic metal can be a combination of other sub-genres of metal, such as Rhapsody of Fire, who are a symphonic power metal band or Dimmu Borgir, a black metal band.
Power metal
Power metal is more upbeat than most metal genres, taking heavy influence from thrash metal and heavy metal, with more progression replacing the electro-blues style, more virtuosity in the guitar leads and solos, and stressing, jaunty tempos. Power Metal often emphasizes clean, melodic, high-pitched vocals and fast pacing that is mostly driven by double bass drumming and melodic lead guitar. The rhythm guitar is defined by straight power chord progressions. Power metal leans toward the positive, happy side of life, seeking to empower the listener and inspire joy and courage. Power metal usually carries fantasy or science fiction themes. Most power metal bands (e.g. Nightwish) are from continental Europe, though a small number (e.g., Jag Panzer, Kamelot, and Manowar) hail from North America.