en CB01 OFFICIAL. Albert and Yvette fall in love in Paris but at a bad time. It’s 1941. He is an occupying German soldier and clarinettist. She is a young French-Czech pianist. When the post-war authorities declare ‘No marriage between enemies!’ who can help the young lovers? Enter Emile: part Emcee, part guardian angel. Leonore 40/45 is an opera written by Rolf Liebermann, Swiss composer and former artistic director of the Paris Opera. The style of the opera belongs to the 1950s, rooted in the 12-tone tradition of Schoenberg and Berg but lightened by lyric interludes and ‘semiseria’ sending up.