Die Fledermaus (The Bat) is an operetta composed by Johann Strauss II to a German libretto by Karl Haffner and Richard Genée.

The original source for Die Fledermaus is a farce by German playwright Julius Roderich Benedix (1811–1873), Das Gefängnis (The Prison). Another source is a French vaudeville play, Le réveillon, by Henri Meilhac and Ludovic Halévy. This was first translated by Karl Haffner into a non-musical play to be produced in Vienna. However, the peculiarly French custom of the réveillon (a midnight supper party) caused problems, which were solved by the decision to adapt the play as a libretto for Johann Strauss, with the réveillon replaced by a Viennese ball. At this point Haffner's translation was handed over for adaptation to Richard Genée, who subsequently claimed not only that he had made a fresh translation from scratch but that he had never even met Haffner.

The operetta premièred on 5 April 1874 at the Theater an der Wien in Vienna, and has been part of the regular operetta repertoire ever since. It was performed in New York under Bial^{[clarification needed]} at the Stadt Theatre on 21 November 1874, and then in English in London at the Alhambra Theatre on 18 December 1876, with the score heavily adapted by Hamilton Clarke. Its first London performance in the original German was in 1895. According to the archivist of the Royal Opera House, Covent Garden, "Twenty years after its production as a lyric opera in Vienna, Mahler raised the artistic status of Strauss's work by producing it at the Hamburg Opera House [...] all the leading opera houses in Europe, notably Vienna and Munich, have brightened their regular repertoire by including it for occasional performance."

Johann Strauss II (October 25, 1825 – June 3, 1899), also known as Johann Baptist Strauss or Johann Strauss, Jr., the Younger, or the Son (German: Sohn), was an Austrian composer of light music, particularly dance music and operettas. He composed over 500 waltzes, polkas, quadrilles, and other types of dance music, as well as several operettas and a ballet. In his lifetime, he was known as "The Waltz King", and was largely then responsible for the popularity of the waltz in Vienna during the 19th century.

Strauss was born in St. Ulrich (now a part of Neubau), the son of Johann Strauss I, another composer of dance music. His father did not wish him to become a composer, but rather a banker; however, the son defied his father's wishes, and went on to study music with the composer Joseph Drechsler and the violin with Anton Kollmann, the ballet répétiteur of the Vienna Court Opera. Strauss had two younger brothers, Josef and Eduard Strauss, who became composers of light music as well, although they were never as well known as their elder brother.

Evgeny Igorevitch Kissin (Russian: Евге́ний И́горевич Ки́син Yevgeniy Igorevich Kisin; born 10 October 1971) is a Russian classical pianist. He first came to international fame as a child prodigy. He has been a British citizen since 2002. He is especially known for his interpretations of the works of the Romantic repertoire, particularly Frédéric Chopin, Rachmaninoff and Franz Liszt.

Kissin was born in Moscow to a Russian Jewish family. Recognized as a child prodigy, at age six, he began piano studies at the esteemed Gnessin School of Music for Gifted Children. At the school, he became a student of Anna Kantor, who remained Kissin's only piano teacher.