Lutosławski composed music for the theatres for quite a long time after the WWII. He co-operated on regular basis with the Polish Theatre. Among the National Library’s collection there are fragments of music for The Cid, Fantazy, The Merry Wives of Windsor, God, Emperor, and Peasant, and in the Archive of Polish Composers of the 20th Century in the Warsaw University Library his music for Horsztyński, Lorenzaccio and The Madwoman of Chaillot. Other scores are kept in the Paul Sacher Foundation. Lutosławski made his first attempt to write music for the theatre as early as 1930 (Haroun al Rashid), but the score was lost.