Jaroslav Krček

Czech radio producer, conductor, inventor of musical instruments and composer of classical and folk music, born 1939 in Čtyři Dvory near České Budějovice.

Raab (aka Raab The Harlot) or Nevěstka Raab (The Prostitute Raab) is one of Krček's most renowned compositions. It was created in the Prague Electronic Music Studio in 1970-71. It is often described as an electronic opera, or electroacoustic oratorio. It was banned by the communist regime in 1972, and it was never staged in Czechoslovakia until the Velvet Revolution of 1989.[4] The music of Raab was composed during the same period as many contemporary avant garde music dramas such as Iannis Xenakis' Nuits (1968) and Bernd Alois Zimmermann's Requiem Für Einen Jungen Dichter (1969).

http://en.wikipedia.org/wiki/Jaroslav_Krcek

See also: Czech_Republic#Electroacoustic_and_experimental_music.2C_sound_art