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'''Progressive rock''', often shortened to '''prog rock''' or '''prog''', is a form of [[rock music]] characterized by lengthy and complicated forms (often based on classical or jazz, and frequently consisting of multiple contrasting sections), the use of instruments not typically found in rock, and complicated harmonies and rhythms.  Other defining features include the "[[concept album]]" (such as ''[[Dark Side of the Moon]]'' or ''[[The Wall]]''), fantasy-based lyrics, and artistic album covers.

'''Progressive rock''', often shortened to '''prog rock''' or '''prog''', is a form of [[rock music]] characterized by lengthy and complicated forms (often based on classical or jazz, and frequently consisting of multiple contrasting sections), the use of instruments not typically found in rock, and complicated harmonies and rhythms.  Other defining features include the "[[concept album]]" (such as ''[[Dark Side of the Moon]]'' or ''[[The Wall]]''), fantasy-based lyrics, and artistic album covers.

Progressive rock arose during the late 1960s and carried on through the 1970s before a decline corresponding to the rise of [[Punk rock|punk]].  [[King Crimson]], [[Yes]], [[Emerson, Lake, & Palmer]], and [[Genesis]] are considered the four "classic" exponents of this genre, although bands as diverse as [[Pink Floyd]], [[Jethro Tull]], and [[Rush]] have been given this label.

Progressive rock arose during the late 1960s and carried on through the 1970s before a decline corresponding to the rise of [[Punk rock|punk]].  [[King Crimson]], [[Yes]], [[Emerson, Lake, & Palmer]], and [[Genesis (band)|Genesis]] are considered the four "classic" exponents of this genre, although bands as diverse as [[Pink Floyd]], [[Jethro Tull]], and [[Rush]] have been given this label.

The genre has been criticized for some of its excesses and pretensions, which led to its downfall in the late 1970s (although bands like [[Pink Floyd]] and [[Rush]] continued to maintain a large following).  This could be seen as a general turn in popular music towards more commercial and easily-accessible forms (such as disco and smooth jazz).

The genre has been criticized for some of its excesses and pretensions, which led to its downfall in the late 1970s (although bands like [[Pink Floyd]] and [[Rush]] continued to maintain a large following).  This could be seen as a general turn in popular music towards more commercial and easily-accessible forms (such as disco and smooth jazz).