The San Antonio Opera was an American opera company located in San Antonio, Texas that produced 16 seasons of opera before filing for bankruptcy and dissolving in 2012.
 The company was founded as the Pocket Opera of San Antonio in 1997 by Mark Richter, and opened its first season in the fall of 1997 with Wolfgang Amadeus Mozart's "Der Schauspieldirektor" at the San Pedro Playhouse.
 Initially the company's productions utilized local artists, but by the 1999-2000 season the company had begun employing internationally recognized artists.
 It simultaneously rebranded itself as the Lyric Opera of San Antonio and began performing at the Lila Cockrell Theatre.
 The opera company changed its name to the San Antonio Opera a few years later.
 Notable artists to have performed with the company include Plácido Domingo, José Carreras, and Andrea Bocelli among others.
An impresario (from the Italian "impresa", "an enterprise or undertaking") is a person who organizes and often finances concerts, plays, or operas, performing a role similar to that of an artist manager or a film or television producer.
 The term originated in the social and economic world of Italian opera, in which from the mid-18th century to the 1830s, the impresario was the key figure in the organization of a lyric season.
 The owners of the theatre, usually noble amateurs, charged the impresario with hiring a composer (until the 1850s operas were expected to be new) and the orchestra, singers, costumes and sets, all while assuming considerable financial risk.
 In 1786 Mozart satirized the stress and emotional mayhem in a single-act farce "Der Schauspieldirektor" ("The Impresario").
 Antonio Vivaldi was unusual in acting as both impresario and composer; in 1714 he managed seasons at Teatro San Angelo in Venice, where his opera "Orlando finto pazzo" was followed by numerous others.
Der Schauspieldirektor ("The Impresario"), K. 486, is a comic "singspiel" by Wolfgang Amadeus Mozart, set to a German libretto by Gottlieb Stephanie, an Austrian "Schauspieldirektor".
 Originally, it was written because of "the imperial command" of the Holy Roman Emperor Joseph II who had invited 80 guests to a private luncheon.
"Nun komm, der Heiden Heiland " (original: "Nu kom der Heyden heyland ", English: "Now come, Saviour of the heathens") is a Lutheran chorale of 1524 with words written by Martin Luther, based on "Veni redemptor gentium " by Ambrose.
 It was printed in the Erfurt "Enchiridion" of 1524.
 The chorale was used as the prominent hymn for the first Sunday of Advent for centuries.
 It was used widely in organ settings by Protestant baroque composers, most notably Johann Sebastian Bach: he set it as the opening chorale prelude BWV 599 of Orgelbüchlein; and three times—as BWV 659 (one of his best known organ compositions), BWV 660 and BWV 661—in his Great Eighteen Chorale Preludes.
 Bach used the hymn in his chorale cantata "Nun komm, der Heiden Heiland", BWV 62 (1724) and in the opening chorale fantasia of his earlier cantata "Nun komm, der Heiden Heiland", BWV 61 , BWV 61 (1714).
 Max Reger composed a chorale prelude as No. 29 of his 52 Chorale Preludes, Op. 67 in 1902.
The Portuguese Chamber Orchestra (OCP) was founded on July 5, 2007 and had its premiere appearance on September 13, 2007, with the opening concert of the 2007/2008 season at the Grand Auditorium of Centro Cultural de Belém, in Lisbon.
 The programme included the overture of "Der Schauspieldirektor" KV 486,W.A.Mozart; Symphony nr 6 in C Major, D 589, F.Schubert; Ballet suite "Pulcinella", I.Stravinsky.
 The head office of OCP is in Oeiras, Portugal.
Hartmut Winkler (born 1953) has been a Professor of Media Studies, Media Theory and Media Arts at the University of Paderborn in Germany since April 1999.
 Winkler is influential in the field of digital media.
 His works include Switching/Zapping (1991), Film Theory, Der Filmische Raum und der Zuschauer (1992) and Computers and Media Theory, Docuverse (1997).
 Another one of his works is "Search Engines: Metamedia on the Internet?"
 (1998), where he attempts to explain how a search engine is a black box, that is, he tries to show that the system of input and output many viewers use is not a legitimate neutral source.
 He also discusses the position of power that search engines have over their users, the structural format that search engines are based on, and how language changes the perspective of the engines.
 He talks about how users do not actually understand how a search engine works and how it is structured, yet we make assumptions about its workings, not truly caring how or why it does what it does, as long as it delivers the information we seek.
Ernani is an operatic "dramma lirico" in four acts by Giuseppe Verdi to an Italian libretto by Francesco Maria Piave, based on the play "Hernani" by Victor Hugo.
Friedemann Layer (born 1941) is an Austrian conductor.
 He was assistant to Herbert von Karajan in Ulm and to Karl Böhm.
 In 1989, he conducted a film version of "Der Schauspieldirektor", with Zdzisława Donat and Christian Boesch in the cast.
The Tsarevich (German: Der Zarewitsch) is a 1933 German historical musical film directed by  Victor Janson and starring  Mártha Eggerth, Hans Söhnker and Ery Bos.
 It is based on the 1927 operetta " Der Zarewitsch" by Franz Lehar.
 It was one of a number of operetta film that Eggerth appeared in during the decade.
Prima la musica e poi le parole ("First the music and then the words"), also called "Prima la musica, poi le parole " is an opera in one act by Antonio Salieri to a libretto by Giovanni Battista Casti.
 The work was first performed on 7 February 1786 in Vienna, following a commission by the Emperor Joseph II.
 The opera (more specifically, a "divertimento teatrale ") was first performed at one end of the orangery of the Schönbrunn Palace in Vienna by an Italian troupe: simultaneously, Mozart's "Der Schauspieldirektor" was staged at the other end.

Question: Which one is based on Hernani, Der Schauspieldirektor or Ernani?
Answer: Ernani