
In the late 1960s, with the release of their first album, the music was initially regarded by the band and the fans as a pop experiment, referring to then-popular melodic pop. Then, over the course of a year, (beginning with their second album in mid-1970) they quickly evolved into a progressive rock band with the incorporation of complex song structures and elaborate instrumentation. Their concerts became theatrical experiences with innovative stage design, pyrotechnics, extravagant costumes and on-stage stories. This second phase was characterised by lengthy performances such as the 23-minute 'Supper's Ready' and the 1974 concept album, The Lamb Lies Down on Broadway. In the late '70s and early '80s the band's musical direction changed once again, becoming more pop oriented and commercially accessible.
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