Editing Progressive rock (section)

====Progressive metal====
{{main|Progressive metal}}

{{Listen
| filename    = Dream Theater - A Change of Seasons (excerpt).ogg
| title       = "A Change of Seasons" by Dream Theater
| description = A multipart suite by Dream Theater that combines elements of progressive rock and heavy metal
| pos         = right
}}
Progressive rock and [[Heavy metal music|heavy metal]] have similar timelines. Both emerged from late-1960s psychedelia to achieve great early-1970s success despite a lack of radio airplay and support from critics, then faded in the mid-to-late 1970s and experienced revivals in the early 1980s. Each genre experienced a fragmentation of styles at this time, and many metal bands from the [[new wave of British heavy metal]] – most notably [[Iron Maiden]] – onwards displayed progressive rock influences.{{sfn|Hegarty|Halliwell|2011|pp=259–260}} [[Progressive metal]] reached a point of maturity with [[Queensrÿche]]'s 1988 concept album ''[[Operation: Mindcrime]],'' [[Voivod (band)|Voivod]]'s 1989 ''[[Nothingface (Voivod album)|Nothingface]]'', which featured abstract lyrics and a King Crimson-like texture, and [[Dream Theater]]'s 1992 ''[[Images and Words]]''.{{sfn|Hegarty|Halliwell|2011|pp=260–262}}

Progressive rock elements appear in other metal subgenres. [[Black metal]] is conceptual by definition, due to its prominent theme of questioning the values of Christianity.{{sfn|Hegarty|Halliwell|2011|p=264}} Its [[Death growl|guttural]] vocals are sometimes used by bands who can be classified as progressive, such as [[Mastodon (band)|Mastodon]], [[Mudvayne]] and [[Opeth]].{{sfn|Hegarty|Halliwell|2011|pp=264, 266}} [[Symphonic metal]] is an extension of the tendency towards orchestral passages in early progressive rock.{{sfn|Hegarty|Halliwell|2011|pp=266–267}} Progressive rock has also served as a key inspiration for genres such as [[post-rock]],<ref name="allen">{{cite web |last=Allen |first=Jim |title=From Tull To Tortoise: Post-Rock's Proggy Past |work=CMJ New Music |url=http://www.e-prog.net/genre/cmj_essay.htm |access-date=20 June 2013 |url-status=dead |archive-url=https://web.archive.org/web/20130203052506/http://www.e-prog.net/genre/cmj_essay.htm |archive-date=3 February 2013}}</ref> [[post-metal]] and [[avant-garde metal]],<ref name="caramanica">{{cite news|last=Caramanica|first=Jon |title=The alchemy of art-world heavy metal|newspaper=International Herald Tribune|date=20 September 2005}}</ref> [[math rock]],<ref name="tudor">{{cite news |last=Tudor |first=Colin |title=CULTURE: Between rock and a harder place; The hardcore stops and starts of the Dillinger Escape Plan prove that rock is still evolving |newspaper=The Birmingham Post |place=England |date=9 December 2003}}</ref> [[power metal]] and [[neo-classical metal]].<ref name="miers">{{cite news |last=Miers |first=Jeff |title=Dance of Death" (Review) |newspaper=The Buffalo News |date=3 October 2003}}</ref>