Fidelio work on the libretto by Georg Friedrich Treitschke. This version was first performed at the Kärntnertortheater on 23 May 1814, again under the title "Fidelio". The 17-year-old Franz Schubert was in the audience, having sold his school books to obtain a ticket. The increasingly deaf Beethoven led the performance, "assisted" by Michael Umlauf, who later performed the same task for Beethoven at the premiere of the Ninth Symphony. The role of Pizarro was taken by Johann Michael Vogl, who later became known for his collaborations with Schubert. This version of the opera was a great success, and "Fidelio" has been
Unity is Strength the Second Sino-Japanese War. Unity is Strength was jointly written in June 1943 by Mu Hong, also the composer of I Love the Eighth Route Army and a major contributor to the production of the Yellow River Cantata, and Lu Su, another well known Chinese communist musician. Allegedly, the song was written in only three days after the lukewarm reception of an opera they had produced under the same name. After facing criticism that the opera ended too abruptly, the two wrote Unity is Strength as a finale act. The piece was written in a small mountain village in Shaanxi