Question: which musical opera or drama, Singspiel or Fedora, is a most notable work from Giordano?

Context articles: Teatro Lirico (Milan)
List of fictional aircraft
Number opera
Fedora (opera)
Die Schuldigkeit des ersten Gebots
Kung Karls jakt
Zaide
Victorien Sardou
Singspiel
Stephen Dolginoff

The Teatro Lirico (known until 1894 as the Teatro alla Canobbiana) is a theatre in Milan, Italy.
 In the 19th and early 20th centuries it was particularly notable for opera performances, including the world premieres of Donizetti's "L'elisir d'amore" and Giordano's "Fedora".
 The theatre, located on Via Rastrelli, closed in 1998.
 However, a restoration project was begun in April 2007, and it was due to re-open in 2009 as the Teatro Lirico Giorgio Gaber.
This is a list of fictional aircraft, including fixed wing, rotary wing, and lighter-than-air vehicles.
 These vehicles are either the subject of a notable work of fiction, or else are important elements of a notable work of fiction.
 Vehicles in this list are intended to operate in an atmosphere.
A number opera (Italian: "opera a numeri" ; German: "Nummeroper" ) is an opera consisting of individual pieces of music ('numbers') which can be easily extracted from the larger work.
 They may be numbered consecutively in the score, and may be interspersed with recitative or spoken dialogue.
 Opera numbers may be arias, but also ensemble pieces, such as duets, trios, quartets, quintets, sextets or choruses.
 They may also be ballets and instrumental pieces, such as marches, sinfonias, or intermezzi.
 The number opera format was standard until the mid-19th century and most opera genres, including "opera seria", "opera buffa", "opéra comique", ballad opera, Singspiel, and grand opera, were constructed in this fashion.
Fedora is an opera in three acts by Umberto Giordano to an Italian libretto by Arturo Colautti, based on the play "Fédora" by Victorien Sardou.
 Along with "Andrea Chénier" and "Siberia", it is one of the most notable works of Giordano.
Die Schuldigkeit des ersten Gebots (complete title in historical spelling: "Die Schuldigkeit Des ersten und fürnehmsten Gebotes "; The Obligation of the First and Foremost Commandment), K. 35, is a sacred musical play ("geistliches Singspiel") composed by Wolfgang Amadeus Mozart in 1767 when he was 11 years old.
 It is Mozart's first opera or, more specifically, "sacred drama", as is suggested by the name.
 The libretto is now attributed to , although Johann Adam Wieland or Jakob Anton Marianus Wimmer had been suggested earlier.
 (The title page of the libretto ascribes it only to "J.A.W.".)
 Only the first part of the opera was composed by Mozart; the second and third parts were contributed by Michael Haydn and Anton Cajetan Adlgasser respectively.
 However, these other two parts have not survived.
 Part 1 of the opera was first performed on March 12, 1767, in the Knight's Hall of the Palace of the Archbishop, the Salzburg Residenz.
 Part 2 was performed on March 19, and part 3 on March 26.
Kung Karls jakt (English: "King Charles' Hunt"; Finnish: "Kaarle-kuninkaan metsästys") is an opera with music by Fredrik Pacius and a libretto by Zacharias Topelius.
 It was the first opera to be composed in Finland.
 "Kung Karls jakt" was first performed in Helsinki on 24 March, 1852.
 Although the text is in Swedish(Swedish and Finnish are both official languages in Finland) it concerns an event from Finnish history when Finland was a province of Sweden in the 17th century.
 The work takes the form of a Singspiel with spoken dialogue between the musical numbers (the king himself does not sing).
 The music is heavily influenced by contemporary German and Italian opera, with a few Finnish elements such as the use of a "kantele" in one scene.
Zaide (originally, "Das Serail") is an unfinished German-language opera, K. 344, written by Wolfgang Amadeus Mozart in 1780.
 Emperor Joseph II, in 1778, was in the process of setting up an opera company for the purpose of performing German opera.
 One condition required of the composer to join this company was that he should write a comic opera.
 At Salzburg in 1779 Mozart began work on a new opera (now known as "Zaide" although Mozart did not give it such a title).
 It contains spoken dialogue, which also classifies it as a "Singspiel" (literally, "singing play").
 Only the arias and ensembles from the first two acts were composed.
 Missing are an overture and third act.
Victorien Sardou (5 September 1831 – 8 November 1908) was a French dramatist.
 He is best remembered today for his development, along with Eugène Scribe, of the well-made play.
 He also wrote several plays that were made into popular 19th-century operas such as "La Tosca" (1887) on which Giacomo Puccini's opera "Tosca" (1900) is based, and "Fedora" by Umberto Giordano, a work that popularized the fedora hat as well.
A Singspiel (] ; plural: Singspiele; literally "sing-play") is a form of German-language music drama, now regarded as a genre of opera.
 It is characterized by spoken dialogue, which is alternated with ensembles, songs, ballads, and arias which were often strophic, or folk-like.
 Singspiel plots are generally comic or romantic in nature, and frequently include elements of magic, fantastical creatures, and comically exaggerated characterizations of good and evil.
Stephen Dolginoff is an award-winning, New York City based playwright-composer.
 His most notable work is "Thrill Me", the musical version of the true story of Leopold and Loeb, which opened Off-Broadway at the York Theatre in 2005, featuring Dolginoff himself as Nathan Leopold.
 Subsequently, it was published by Dramatists Play Service, and has had over 150 productions in 16 countries and 10 languages.
 It has been performed in major cities across America, as well as internationally in cities such as Toronto, London, Melbourne & Sydney, Australia; Athens, Greece, Datteln Germany; Shanghai, China, Tokyo, Japan and Seoul, South Korea Dolginoff won an ASCAP Music Award for the score of "Thrill Me" and was nominated for New York's Drama Desk Award for both Best Musical and Best Music Score as well as an Outer Critics Circle Award nomination for Best Off-Broadway Musical.
 The Los Angeles production was nominated for an Ovation Award for Best Musical in an Intimate Theatre.
 In 2009, Dolginoff received a Los Angeles Garland Award honorable mention for the Music & Lyrics of "Thrill Me".