Question: A comic opera composed in 1917–18 contains an aria sung by who? 

Context articles: Gianni Schicchi
Insertion aria
Ch'ella mi creda
Nell Gwynne (operetta)
Catalogue aria
Old Sarah
Der Hölle Rache kocht in meinem Herzen
O mio babbino caro
A Welsh Sunset
Non piangere, Liù

Gianni Schicchi (] ) is a comic opera in one act by Giacomo Puccini to an Italian libretto by Giovacchino Forzano, composed in 1917–18.
 The libretto is based on an incident mentioned in Dante's "Divine Comedy".
 The work is the third and final part of Puccini's "Il trittico" (The Triptych)—three one-act operas with contrasting themes, originally written to be presented together.
 Although it continues to be performed with one or both of the other "trittico" operas, "Gianni Schicchi" is now more frequently staged either alone or with short operas by other composers.
 The aria "O mio babbino caro" is one of Puccini's best known, and one of the most popular arias in opera.
An insertion aria (also known as interpolated aria, trunk aria, or aria di baule in Italian) is an aria sung in an opera for which it was not composed.
 It was a practice that began in the seventeenth century and continued actively through the late 19th century and sporadically through the 20th century.
 The insertion aria could replace an existing aria, or might be added to an opera.
 All insertions were planned in advance.
 They might be composed by the same composer of the opera, or might have been written by a different composer, with or without the knowledge of the opera's composer.
 Most insertions were of arias; infrequently non-operatic songs were inserted.
 Insertions could consist of arias, duets, ensembles, even entire scenes.
 Although men and women singers used insertion, women are the ones most remembered for the practice.
 The years 1800–1840 represent the apex of influence that women singers exerted over the operatic stage, influencing most aspects of opera performances, including insertions.
"Ch'ella mi creda" is a tenor aria from act 3 of the opera "La fanciulla del West" by Giacomo Puccini.
 It is the tenor aria sung by Dick Johnson (a.k.a. the bandit "Ramerrez") before he is to be executed by a lynch mob of gold prospectors led by Sheriff Jack Rance.
 In the aria, Johnson asks them not to tell Minnie, whom he loves, that he has been killed.
 Instead, he asks them to "let her believe" (the title phrase, "ch'ella mi creda") that he is far away, on the road to redemption from his bandit past.
Nell Gwynne is a three-act comic opera composed by Robert Planquette, with a libretto by H. B. Farnie.
 The libretto is based on the play "Rochester" by William Thomas Moncrieff.
 The piece was a rare instance of an opera by a French composer being produced first in London.
 Farnie had written an earlier libretto on the same subject, with the same name, for composer Alfred Cellier, which was produced at the Prince's Theatre in Manchester in 1876.
A catalogue aria is a genre of opera aria in which the singer recounts a list of information (people, places, food, dance steps, etc.) that was popular in Italian comic opera in the latter half of the eighteenth and early nineteenth centuries. "
Madamina, il catalogo è questo" from Wolfgang Amadeus Mozart's "Don Giovanni" is the most famous example, and is often referred to as "the catalogue aria".
 Leporello notes how many lovers the title character has had in each country he has visited.
 Pasquale sings two such arias in Joseph Haydn's "Orlando paladino", "Ho viaggiato in Francia, in Spagna" in act one, which lists the countries to which he has traveled, and "Ecco spiano" in act 2, which rattles off all of his varied musical talents.
Old Sarah is a one-act comic opera composed by François Cellier with a libretto by Harry Greenbank.
"Der Hölle Rache kocht in meinem Herzen " ("Hell's vengeance boils in my heart"), commonly abbreviated "Der Hölle Rache ", is an aria sung by the Queen of the Night, a coloratura soprano part, in the second act of Mozart's opera "The Magic Flute" ("Die Zauberflöte ").
 It depicts a fit of vengeful rage in which the Queen of the Night places a knife into the hand of her daughter Pamina and exhorts her to assassinate Sarastro, the Queen's rival, on pain of denying and cursing Pamina if she does not comply.
"O mio babbino caro " ("Oh My Beloved Father") is a soprano aria from the opera "Gianni Schicchi" (1918) by Giacomo Puccini to a libretto by Giovacchino Forzano.
 It is sung by Lauretta after tensions between her father Schicchi and the family of Rinuccio, the boy she loves, have reached a breaking point that threatens to separate her from Rinuccio.
 It provides an interlude expressing lyrical simplicity and single-hearted love in contrast with the atmosphere of hypocrisy, jealousy, double-dealing, and feuding in the medieval Florence of Puccini's only comedy.
 It provides the only set-piece in the through-composed opera.
A Welsh Sunset is a one-act comic opera composed by Philip Michael Faraday, with a libretto by Frederick Fenn.
 It was produced at the Savoy Theatre from 15 July 1908 and played with revivals of "H.M.S. Pinafore" and "The Pirates of Penzance" until 17 October 1908, and from 2 December 1908 until 24 February 1909, a total of 85 performances.
 A copy of the vocal score (published in 1908 by Metzler), but no printed libretto, is found in the British Library.
 The score contains all the dialogue.
"Non piangere, Liù" (Don't cry, Liù) is an aria sung by Calàf, the "Unknown Prince", in Act I of the Italian opera Turandot, by Giacomo Puccini.
 The lyrics were written by Giuseppe Adami and Renato Simoni.
 The scene takes place before the walls of the imperial palace.
 In the preceding aria ("Signore, ascolta!
" - "My lord, listen!" )
, Liù begs Calàf not to risk his life by playing a deadly game to marry Princess Turandot, and Calàf responds to her gently, asking her not to cry.