102 artists, 3350 songs
Emerging from the late '60s psychedelic rock scene, progressive rock artists continued to expand the boundaries of rock by incorporating classical-inspired instrumental virtuosity and cerebral literary elements. These bands took advantage of the increasing popularity of long-playing records to compose albums featuring extended songs often held together by a single theme or concept, similar to an opera or symphony. Bands like Yes and Genesis experimented with complex time signatures, frequent tempo changes and lengthy instrumental passages featuring improvised solos. Progressive rock bands like Emerson, Lake and Palmer, Jethro Tull and Pink Floyd performed elaborately staged concerts in the 1970s that were as impressive for their visual spectacle as they were for their virtuosic displays of musicianship.