Question: Ghena Dimitrova, was a Bulgarian operatic soprano, her voice was known for its power and extension used in operatic roles such as which opera in three acts by Giacomo Puccini, completed by Franco Alfano, and set to a libretto in Italian by Giuseppe Adami and Renato Simoni?
Context: "In questa reggia" ("In this palace") is an aria from Giacomo Puccini's opera "Turandot" set to a libretto in Italian by Giuseppe Adami and Renato Simoni.  The text is based on Friedrich Schiller's adaptation of the play "Turandot" by Carlo Turandot ( ; ] ; ) is an opera in three acts by Giacomo Puccini, completed by Franco Alfano, and set to a libretto in Italian by Giuseppe Adami and Renato Simoni. Renato Simoni (Verona, 5 September 1875 – Milan, 5 July 1952) was an Italian journalist, playwright, writer and theatrical critic noted for his collaboration work with Giuseppe Adami for Giacomo Puccini's "Turandot". Ghena Dimitrova (Bulgarian: Гeна Димитpова ) (6 May 1941 – 11 June 2005) was a Bulgarian operatic soprano.  Her voice was known for its power and extension used in operatic roles such as Turandot in a career spanning four decades. La rondine ("The Swallow") is an opera in three acts by Giacomo Puccini to an Italian libretto by Giuseppe Adami, based on a libretto by Alfred Maria Willner and .  It was first performed at the Grand Théâtre de Monte Carlo (or the Théâtre du Casino) in Monte Carlo on 27 March 1917. "Tu che di gel sei cinta " (You who are enclosed by ice) is a soprano aria from act 3, scene 1, of Puccini's 1926 opera "Turandot".  The words were actually written by Puccini himself.  Waiting for librettists Giuseppe Adami and Renato Simoni to deliver the next part of the libretto, he wrote the words, and when they read them they decided that they could not do better.  It is sung by Liù under torture, prior to her suicide.  Turandot is clearly taken by Liù's resolve and asks her who put so much strength in her heart.  Liù answers "Princess, Love!" . "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. Il tabarro (The Cloak) is an opera in one act by Giacomo Puccini to an Italian libretto by Giuseppe Adami, based on Didier Gold's play "La houppelande".  It is the first of the trio of operas known as "Il trittico".  The first performance was given on 14 December 1918 at the Metropolitan Opera in New York City. Galina Savova (Bulgarian: Галина Савова ) (born 1945) is a Bulgarian operatic soprano.  The singer completed her education first in Varna, in Sofia and then began her career in 1966 with a beginner's engagement at the National Opera House of the Bulgarian capital.  She sang there already lots from the Slavic and the Italian operatic repertoire, as it was set in 1971 at a guest performance of the Opera of Sofia at the Paris Grand Opera in the title role of Puccini's "Turandot". Natalia Troitskaya (1951 – 9 April 2006) was a Russian operatic soprano who had a major international career during the 1980s and early 1990s.  She particularly excelled in the operas of Giacomo Puccini and Giuseppe Verdi.  Among her signature roles were Tatyana in Pyotr Ilyich Tchaikovsky's "Eugene Onegin" and the title heroines in Verdi's "Aida", Puccini's "Manon Lescaut", and Puccini's "Tosca".  She was a frequent partner of Plácido Domingo during the 1980s and also sang opposite other great artists like Montserrat Caballé, Dmitri Hvorostovsky, and Luciano Pavarotti.
Answer: Turandot