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Progressive rock (also, prog or prog rock) is a subgenre of rock music that evolved in the late...

Progressive rock (also, prog or prog rock) is a subgenre of rock music that evolved in the late 1960s and early 1970s as part of a "mostly British attempt to elevate rock music to new levels of artistic credibility." Progressive rock bands pushed "rock's technical and compositional boundaries" by going beyond the standard rock or popular verse-chorus-based song structures. Additionally, the arrangements often incorporated elements drawn from classical, jazz, and world music. Instrumentals were common, while songs with lyrics were sometimes conceptual, abstract, or based in fantasy. Progressive rock bands sometimes used "concept albums that made unified statements, usually telling an epic story or tackling a grand overarching theme." Progressive rock developed from late 1960s psychedelic rock, as part of a wide-ranging tendency in rock music of this era to draw inspiration from ever more diverse influences. The term was applied to the music of bands such as King Crimson, Yes, Genesis, Pink Floyd, Jethro Tull, Soft Machine, and Emerson, Lake & Palmer, and reached its peak of popularity in the mid 1970s. Form: Progressive rock music either avoids common popular music song structures