Having previously challenged their audience with the lengthy opus Thick as a Brick, Jethro Tull went back to the concept-album for the even more difficult A Passion Play. The sometimes impenetrable work is part biblical allegory, part postmodern epic poem, and part psychedelic fairy tale. Such were the machinations of 1970s prog rock. The music mixes rock, English folk, and neoclassical material, an amalgamation that somehow hangs together.
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