High Quality Content by WIKIPEDIA articles! Paradise Lost is an opera in two acts with music by Krzysztof Penderecki and an English libretto by Christopher Fry. The opera is based on the epic poem of the same name by Milton. Penderecki himself characterized the work as a Sacra Rappresentazione (sacred representation) rather than an opera. He wrote the opera on commission for the 1976 US Bicentennial celebrations. The first performance was given on 29 November 1978, at the Lyric Opera of Chicago. The same production was given at La Scala, Milan in 1979.