Ostrčil's main output consists of six operas: Jan Zhořelecký (written as a student under Fibich, 1898, unperformed), Vlasty skon (Vlasta's passing, premiered 1904, to a libretto previously considered by Smetana and Fibich), Kunálovy oči (Kunála's eyes, 1908), Poupě (The Bud, 1912), Legenda z Erinu (A Legend of Erin, 1921), and Honzovo království (Johnny's Kingdom, based on a short story by Leo Tolstoy, 1934). His most significant orchestral music includes Symphony in A (1906), Impromptu (1912), Suite in c minor (1914), Symfonietta (1922), Léto (Summer, tone poem, 1927), and Křížova cesta (The Way of the Cross, orchestral variations, 1929). Beyond these, he also composed various works for chamber and choral ensembles; much like his main musical influence, Gustav Mahler, his rigorous conducting schedule rarely allowed free time for composition, with the exception of the summers when the theater was not in season.
As a conductor, Ostrčil had a significant influence on his younger contemporaries in the interwar period. From the beginning of his time at the National Theater he conceived new ideas of musical leadership and choice of repertoire, wherein representatives of the current generation of musical modernism, both at home and abroad, would be presented to Prague audiences as a matter of cultural responsibility. As a result, under Ostrčil, Prague saw the Czech premieres of works by Debussy, Strauss, Stravinsky, Darius Milhaud, Zich, and most importantly, the opera Wozzeck by Alban Berg in 1926.
These programming choices met with extreme controversy over his entire fifteen-year administration at the National Theater, especially from conservative critics such as Antonín Šilhan, who branded the conductor as an anti-Czech pro-communist traitor, and whose articles prompted a riot at the third performance of Wozzeck. (Many of these criticisms had to do with Ostrčil's close association with Nejedlý, who by this time was a strong proponent of the Czechoslovak Communist Party. It was Ostrčil's belief in the necessity of presenting modern art to the public that won him many supporters among the students of Prague, led by the young pedagogue and microtonal composer Alois Hába; in a climate increasingly unsympathetic to modernist exploration, the conductor was hailed as a hero.
His untimely death in 1935, at the height of his career, was a bitter blow to the community, and for the remainder of the democratic era (to 1938) his achievements were continually rhapsodized in print.
Operas
Melodramas