Question: Romilda Pantaleoni is associated with her roles of La Gioconda and Margherita in what opera
Context: Jean-Claude Auvray is a French opera director.  In 1973 he was appointed by Rolf Libermann to direct the Paris Opera in their productions of Puccini's "Tosca" (Puccini) and Mozart's "Così fan tutte". " Le Nozze di Figaro" was acclaimed in 1974.  Among his 150 and more productions are "Tancredi" (Rossini), "La Gioconda" (Ponchielli), "Tristan und Isolde" (Wagner), "Manon" (Massenet), "Peter Grimes" (Britten), "Fidelio" (Beethoven), "Otello, "Aida" (Verdi), "La bohème" and "Gianni Schicchi" (Puccini).  Between 1996 and 2006 he directed plays at the Israeli Opera. Corrado Zambelli (3 June 1897 - 1 September 1974) was an Italian classical bass who had an active international singing career in operas and concerts from the 1920s through the 1950s.  He appears on several complete opera recordings, including "Otello" and "Carmen" for His Master's Voice; and "Ernani", "Il trovatore", "La favorite", and "La Gioconda" for Columbia Records. Plácido Domingo has made hundreds of opera performances, music albums, and concert recordings throughout his career as an operatic tenor.  From his first operatic leading role as Alfredo in "La traviata" in 1961, his major debuts continued in swift succession: "Tosca" at the Hamburg State Opera and "Don Carlos" at the Vienna State Opera in 1967; "Adriana Lecouvreur" at the Metropolitan Opera, "Turandot" in Verona Arena and "La bohème" in San Francisco in 1969; "La Gioconda" in 1970; "Tosca" in Royal Opera House, Covent Garden in 1971; "La bohème" at the Bavarian State Opera in 1972; "Il trovatore" at the Paris Opéra in 1973 and "Don Carlo" at the Salzburg Festival in 1975, "Parsifal" in 1992 at the Bayreuth Festival; and the list continues until today; the same role is often recorded more than once. La Gioconda was a cafe in London's Tin Pan Alley — Denmark Street — where musicians such as David Bowie and Elton John would eat and meet other people in the music business.  The premises subsequently became the Barino coffee bar.  The name was then revived as the Giaconda Dining Room in 2008 which expanded to the Giaconda Dining Rooms before being renamed La Giaconda and then closing in 2014. Sebastián Julián Gayarre Garjón (9 January 1844 in Roncal, Navarre – 2 January 1890 in Madrid), better known as Julián Gayarre, was a Spanish opera singer who created the role of Marcello in Donizetti's "Il Duca d'Alba" and Enzo in Ponchielli's "La Gioconda". Gioconda Vessichelli (born in Rome, Italy) is an opera singer.  Gioconda is the inventor and pioneer of BollywoOPERA style.  She has sung in the Bollywood movie "Prague "in 2013, and she has given her voice for the Bollywood movie "Mary Kom" on the song "Ziddi dil" together with Vishal Dadlani.On 19th May 2017 her song "Itni si baat hai" has been released by the label T-series.  On 20 December 2014 the song "Thodi Daaru" was released featuring Mika Singh.  Gioconda has done live performances as first fusion ever between opera and classical Hindi music with artists of the caliber of Grammy Award winner Sukhwinder Singh, Hari Haran, Gino Banks, Niladri Kumar, Silvaganesha, in festivals and auditoriums like Nehru Centre[20] in Mumbai.  She collaborates with Anup Jalota, and many others.  On 31 March 2016 her international video "We are one" in which she sings and acts together with Anup Jalota for peace in the world has been launched from the Minister of India in Delhi.  She is in the annual book of Italian opera singer for having sung in the first world edition of contemporary opera at "Teatro comunale di Modena", broadcast on Italian state radio RAI.  Gioconda is the first singer in the premiere world ever of the contemporary opera “Lavinia fuggita” by Matteo d’Amico.  She has two degrees in opera singing and musicology from Italian conservatory "Santa Cecilia" and international high school of opera "H.Wolf".  The tenor Luciano Pavarotti has been her teacher, among other opera singers who selected her as one of the best students.  She was selected as best singer at accademia rossiniana in Pesaro and she debuts the role of "Madama cortese" in "il viaggio a Reims" by Rossini with the symphonic orchestra of Rof at Rossini theatre in Pesaro.  She sings again in a Rossini opera at Ercolano international opera season in "Il barbiere di Siviglia" and at teatro Politeama opera season in Lecce.  After Rossini she debuts "Carmen" by Bizet.  Her interpretation of the role "Mimì" in the opera "La Boheme" by Puccini received positive critiques. Romilda Pantaleoni (1847 – 20 May 1917) was an Italian soprano who had a prolific opera career in Italy during the 1870s and 1880s.  She sang a wide repertoire that encompassed bel canto roles, Italian and French grand opera, verismo operas, and the German operas of Richard Wagner.  She became particularly associated with the roles of Margherita in Boito's "Mefistofele" and the title role in Ponchielli's "La Gioconda"; two roles which she performed in opera houses throughout Italy.  She is best remembered today for originating the roles of Desdemona in Giuseppe Verdi's "Otello" (1887) and Tigrana in Giacomo Puccini's "Edgar" (1889).  Universally admired for her acting skills as well as her singing abilities, Pantaleoni was compared by several critics to the great Italian stage actress Eleonora Duse. Virginia Guerrini (20 February 1871, Brescia – 26 February 1948, Brescia) was an Italian operatic mezzo-soprano.  She made her professional opera debut at the Garibaldi Theatre in Treviso as Elsa in Richard Wagner's "Lohengrin" in 1889.  The following year she made her debuts at the Teatro Lirico Giuseppe Verdi as Laura in "La Gioconda", the Teatro Dal Verme in Milan as Adalgisa in Vincenzo Bellini's "Norma", the Liceu in Ortrud in "Lohengrin", and Loretta in Alberto Franchetti's "Asrael" at the Teatro Regio in Turin. La Gioconda is an opera in four acts by Amilcare Ponchielli set to an Italian libretto by Arrigo Boito (as Tobia Gorrio), based on "Angelo, Tyrant of Padua", a play in prose by Victor Hugo, dating from 1835.  (This is the same source as Gaetano Rossi had used for his libretto for Mercadante's "Il giuramento" in 1837). Dance of the Hours (Italian: "Danza delle ore ") is a short ballet and is the act 3 finale of the opera "La Gioconda" composed by Amilcare Ponchielli.  It depicts the hours of the day through solo and ensemble dances.  The opera was first performed in 1876 and was revised in 1880.  Later performed on its own, the "Dance of the Hours" was at one time one of the best known and most frequently performed ballets.  It became even more widely known after its inclusion in the 1940 Disney animated film "Fantasia" where it is depicted as a comic ballet featuring anthropomorphized ostriches, hippos, elephants, and alligators.
Answer: Mefistofele