Question: In the 19th century opera composer Leo Slezak and the infamous Mozart originated from which European country?

<P0-S0> Vienna has been an important center of musical innovation. <P0-S1>  Joseph Haydn, Wolfgang Amadeus Mozart, Ludwig van Beethoven, Franz Schubert and Johann Strauss II, among others, were associated with the city, with Schubert being born in Vienna. <P0-S2>  During the Baroque period, Slavic and Hungarian folk forms influenced Austrian music. <P0-S3>  18- and 19th-century composers were drawn to the city due to the patronage of the Habsburgs, and made Vienna the European capital of classical music. <P0-S4>  Vienna's status began its rise as a cultural center in the early 16th century, and was focused around instruments including the lute. <SEP> <P1-S0>  He was associated in particular with Austrian opera as well as the title role in Verdi's "Otello". <P1-S1> Leo Slezak (] ; 18 August 1873 – 1 June 1946) was a world-famous Moravian tenor. <P1-S2>  He is the father of actors Walter Slezak and Margarete Slezak and grandfather of the actress Erika Slezak. <SEP> <P2-S0> This is a list of operas by Argentine composers. <P2-S1>  Argentina's first native born opera composer was Francisco Hargreaves (1849-1900) who composed "La gatta bianca" (1875) and "Los estudiantes de Bologna" (1897), followed by Zenón Rolón (1856-1902) who composed several operas as well as operettas and zarzuelas. <P2-S2>  The works of many of the composers from this generation were first performed outside Argentina. <P2-S3>  Native Argentine opera was to develop much more with the massive European (mainly Italian) immigration in the late 19th century and even more with the opening of the Teatro Colón in 1908 where most of the 20th century operas listed here had their world premieres. <P2-S4>  Some of the first operas to treat Argentine subjects or national themes were Arturo Berutti's "Pampa" (1897) based on the life of Juan Moreira and "Yupanki" (1899) based on the life of Inca warrior Manqu Inka Yupanki. <P2-S5>  Also notable in this genre were Felipe Boero's "Tucumán" (1918) set during the Battle of Tucumán and "El matrero" (1929). <P2-S6>  Considered by many to be the quintessential Argentine opera, "El matrero" had a libretto based on gaucho folk tradition and incorporated Argentine folk melodies and a traditional gaucho dance. <P2-S7>  The Spanish playwright Federico García Lorca was also the inspiration for several Argentine operas. <P2-S8>  His plays, "La zapatera prodigiosa" and "Bodas de sangre", were the basis of operas by Juan José Castro, while Osvaldo Golijov's 2003 opera "Ainadamar" is based on events in the playwright's life. <SEP> <P3-S0> This is an inclusive list of opera festivals and summer opera seasons, and music festivals which have opera productions. <P3-S1>  This list may have some overlap with list of early music festivals. <P3-S2>  Opera is part of the Western classical music tradition, and has long been performed for audiences on a large-scale format. <P3-S3>  It started in Italy at the end of the 16th century and soon spread through the rest of Europe. <P3-S4>  In the 18th century, Italian opera continued to dominate most of Europe (except France), attracting foreign composers such as Handel. <P3-S5>  Opera seria was the most prestigious form of Italian opera, until Gluck reacted against its artificiality with his "reform" operas in the 1760s. <P3-S6>  Today the most renowned figure of late 18th century opera is Mozart, and his music is at times the featured attraction of opera and early music festivals. <P3-S7> .