Luciano Mariani (1801 – 10 June 1859) was an Italian operatic bass.
 Amongst the several roles he created were Rodolfo in Bellini's "La sonnambula" [Milan, Teatro Carcano, 1831], Alfonso d'Este in Donizetti's "Lucrezia Borgia" and Oroe in Rossini's "Semiramide".
 His elder sister, Rosa Mariani, was also an opera singer (contralto) and sang Arsace in the premiere of "Semiramide".
 They toured Italy singing together in many operas.
 Mariani sang in Lisbon at the Teatro São Carlos from 1839 to 1840, where he appeared in several Portuguese premieres of Italian operas, as well as the world premieres of Antonio Luís Miró's opera "Virginia" and Manuel Inocêncio Liberato dos Santos's opera "Inês de Castro".
 Mariani was born in Cremona and died in Castell'Arquato, aged 58.
Erik Ole Bye (20 March 1883 – 17 May 1953) was a Norwegian operatic baritone.
 He studied singing with Morgenstierne in Oslo, zur Muhlen in London and R. Willani in Paris.
 He made his professional opera debut in 1913 at the National Theatre, Oslo as Don Basilio in Gioachino Rossini's "The Barber of Seville".
 From 1914-1917 he was a member of the Breslau Opera House; making his debut there as Amonasro in Giuseppe Verdi's "Aida".
 In 1917 he sang with the Opéra-Comique in Paris.
 In November 1918 he sang the role of the High Priest in Camille Saint-Saëns's "Samson et Dalila" for the opening of the new opera house in Oslo.
 From 1921-1932 he was primarily active with opera companies and orchestras in North America.
 He returned to Norway in 1932 where he continued to perform and worked as a businessman.
 He made recordings for Columbia Records, His Master's Voice, and the Victor Talking Machine Company.
 His son, Erik Bye, was a prominent Norwegian journalist.
Gioachino Antonio Rossini (] ; 29 February 179213 November 1868) was an Italian composer who wrote 39 operas, as well as some sacred music, songs, chamber music and piano pieces.
Armida is an opera in three acts by Josef Mysliveček set to a libretto by Giovanni Ambrogio Migliavacca based on an earlier libretto by Philippe Quinault.
 It is one of many operas set at the time of the Crusades that is based on characters and incidents from Torquato Tasso's epic poem "La Gerusalemme liberata".
 This opera (and all the rest of Mysliveček's operas) belong to the serious type in Italian language referred to as "opera seria".
 It incorporates many elements from the operatic "reform" movement of the 1770s, including short vocal numbers and short choruses incorporated into the fabric of the drama and lavish use of accompanied recitative.
Jonas Marius Lied (17 July 1881 in Sølsnes, Veøy – 25 April 1969 at Sølsnes, Molde) was a Norwegian entrepreneur, businessman, diplomat, author and art collector.
 He obtained a short vocational business education and was proficient in English, French, German and Russian.
 Lied was also a noted athlete, for instance in 1906 together with Erik Ole Bye he won the Lyle Cup for double sculls.
 He established The Siberian Steamship, Manufacturing & Trading Company (the Siberian Company) in 1912 with the purpose of importing and exporting goods through a new northern shipping lane and the Ob River and Yenisei River.
 He obtained Russian citizenship with the help of Grand Duke Alexander, but regained Norwegian citizenship in 1931 when he left the difficult times in the Soviet Union.
 According to the Russian tradition, he long used the signature "I.G. Lid" (Jonas Hansson Lied) after his father Hans (Gans).
Gaetano Fraschini (16 February 1816 – 23 May 1887) was an Italian tenor.
 He created many roles in 19th century operas, including five composed by Giuseppe Verdi.
 His voice was "heroic ... with a baritonal quality, ... yet Verdi and Donizetti appreciated his ability to sing softly and with subtlety."
 An Italian biographer has pointed out Fraschini's role in extending the longevity of Donizetti's operas, while at the same time accelerating the ascent of Verdi's repertory.
 He was indeed the most prominent singer who facilitated the transition from Donizetti to Verdi.
 Fraschini sang over one hundred roles and Verdi placed him at the top of his favorite tenors' list and described him as a "natural Manrico" for his "Il trovatore".
 Fraschini also played a pivotal role in the success of many operas by Pacini and Mercadante.
Kirkelig Kulturverksted is a Norwegian company and record label, founded in 1974 by Erik Hillestad.
 Among the musicians who have issued records on the label are Ketil Bjørnstad, Kari Bremnes, Erik Bye, Ole Paus, Sigvart Dagsland, Bjørn Eidsvåg, Knut Reiersrud, Deeyah and SKRUK.
The American Opera Society (AOS) was a New York City based musical organization that presented concert and semi-staged performances of operas between 1951 and 1970.
 The company was highly influential in sparking and perpetuating the post World War II bel canto revival, particularly through a number of highly lauded productions of rarely heard works by Gioachino Rossini, Gaetano Donizetti, and Vincenzo Bellini.
 The AOS also presented many operas to the American public for the first time, including the United States premieres of Benjamin Britten's "Billy Budd", Giuseppe Verdi's "Giovanna d'Arco", George Frideric Handel's "Hercules" and Hector Berlioz's "Les troyens" to name just a few.
The Carl Rosa Opera Company was founded in 1873 by Carl August Nicholas Rosa, a German-born musical impresario, to present opera in English in London and the British provinces.
 The company premiered many operas in the UK, employing a mix of established opera stars and young singers, reaching new opera audiences with popularly priced tickets.
 It survived Rosa's death in 1889, and continued to present opera in English on tour until 1960, when it was obliged to close for lack of funds.
 The company was revived in 1997, presenting mostly lighter operatic works including Gilbert and Sullivan.
 The company "was arguably the most influential opera company ever in the UK".
Valery Kritskov is a Russian conductor who used to take conducting lessons at the Moscow Institute of Culture which were taught by Kirill Tikhonov.
 He graduated from there in 1988 and then worked in Moscow-based Helikon Opera till he got employed with Novaya Opera in 2002.
 While there, he conducted many operas including Nikolai Rimsky-Korsakov's "The Snow Maiden" and "The Tsar’s Bride" as well as Anton Rubinstein's "The Demon" and Tchaikovsky's "The Maid of Orleans".
 He also conducted works by the Italian composers such as Pietro Mascagni's "Cavalleria rusticana" and Ruggero Leoncavallo's "Pagliacci" and German such as Richard Wagner's "Lohengrin" and Strauss' "Die Fledermaus" as well as a concert dedicated to Vincenzo Bellini.
 Besides operas, he is also known for his conducting of the Russian ballet based on works by Tchaikovsky and Sergei Prokofiev as well as German and Austrian ballet composers such as Ludwig Minkus and Charles Gounod.
 Later on, he became a conductor of the Coppélia ballet which was based by Léo Delibes work and was produced by Imperial Russian Ballet.
 Currently he has two CD recordings called "Chorus of the Novaya Opera Theatre of Moscow" and the "Soloists of the Novaya Opera Theatre of Moscow".

Question: How many operas were written by the writer of the opera in which Erik Ole Bye debuted?
Answer: 39