Sergei Sergeyevich Prokofiev ( ; Russian: Сергей Сергеевич Прокофьев , "Sergej Sergejevič Prokofjev" ; 27 April 1891 – 5 March 1953) was a Soviet composer, pianist and conductor.
 As the creator of acknowledged masterpieces across numerous musical genres, he is regarded as one of the major composers of the 20th century.
 His works include such widely heard works as the March from "The Love for Three Oranges," the suite "Lieutenant Kijé", the ballet "Romeo and Juliet" – from which "Dance of the Knights" is taken – and "Peter and the Wolf."
 Of the established forms and genres in which he worked, he created – excluding juvenilia – seven completed operas, seven symphonies, eight ballets, five piano concertos, two violin concertos, a cello concerto, a Symphony-Concerto for cello and orchestra, and nine completed piano sonatas.
Sergei Olegovich Prokofieff (16 January 1954 – 26 July 2014) was a Russian anthroposophist.
 He was the grandson of the composer Sergei Prokofiev and his first wife Lina Prokofiev, and the son of Oleg Prokofiev and his first wife Sofia Korovina.
 Born in Moscow, he studied fine arts and painting at the Moscow School of Art.
 He encountered anthroposophy in his youth, and soon made the decision to devote his life to it.
Visions fugitives, Op. 22, are a series of short piano pieces composed by Russian composer Sergei Prokofiev (1891–1953) between 1915 and 1917.
 They were premiered by Prokofiev on April 15, 1918 in Petrograd, Soviet Union.
 They were written individually, many for specific friends of Prokofiev's, and he originally referred to them as his "doggies" because of their "bite".
 In August 1917, Prokofiev played them for Russian poet Konstantin Balmont, and others, at the home of a mutual friend.
 Balmont was inspired to compose a sonnet on the spot, called "a magnificent improvisation" by Prokofiev who named the pieces ""Mimolyotnosti"" from these lines in Balmont's poem: ""In every fleeting vision I see worlds, Filled with the fickle play of rainbows"".
 A French-speaking friend at the house, Kira Nikolayevna, immediately provided a French translation for the pieces: "Visions Fugitives".
 Prokofiev often performed only a couple of them at a time as encores at the end of his performances.
Luise Willer (1888–1970) was a German operatic contralto.
 She made her professional opera debut in 1910 as Annius in Wolfgang Amadeus Mozart's "La clemenza di Tito".
 She spent most of her career performing at the Bavarian State Opera in Munich.
 At the Bayreuth Festival, she portrayed Brängane in "Tristan und Isolde".
 She created roles in several world premieres during her career, including Barbara in Erich Wolfgang Korngold's "Violanta" (1916), Lukrezia in Hans Pfitzner's "Palestrina" (1917), Graben-Liese in Franz Schreker's "Das Spielwerk" (1920), and Herzogin in Pfitzner's "Das Herz" (1931) among others.
Sergei Prokofiev set to work on his Piano Concerto No. 2 in G minor, Op. 16, in 1912 and completed it in 1913.
 But this concerto is lost; the score was destroyed in a fire following the Russian Revolution.
 Prokofiev reconstructed the work in 1923, two years after finishing his Third Concerto, and declared it to be “so completely rewritten that it might almost be considered [Concerto] No. 4”; indeed its orchestration has features that clearly postdate the 1921 concerto.
 Performing as solo pianist, Prokofiev premiered this surviving “No. 2” in Paris on 8 May 1924 with Serge Koussevitzky conducting.
 It is dedicated to the memory of Maximilian Schmidthof, a friend of Prokofiev's at the St. Petersburg Conservatory who had killed himself in 1913.
Fritz Schaetzler (May 13, 1898 – February 3, 1994) was a German baritone and "Kammersänger."
 He studied under Anna Bahr-Mildenburg.
 From 1919 to 1922, he was engaged at the Nationaltheater München; from 1922-1947, he was engaged at the Staatsoper Stuttgart.
 Concealing physical disabilities, including an amputated leg and a paralyzed hand, that resulted from injuries suffered during the Second Battle of Flanders, he performed throughout Europe (Prague, Bordeaux, Oslo et al.).
 Over the course of his career, he collaborated with prominent conductors and composers of the era (Hans Knappersbusch, Clemens Krauss, Bruno Walter, Wilhelm Furtwaengler, Richard Strauss, Hans Pfitzner, Carl Orff, Ernst Krenek et al.).
 Roles included Wolfram, Beckmesser, Figaro, Rigoletto, Tonio.
Hans Erich Pfitzner (5 May 1869 – 22 May 1949) was a German composer and self-described anti-modernist.
 His best known work is the post-Romantic opera "Palestrina", loosely based on the life of the sixteenth-century composer Giovanni Pierluigi da Palestrina.
Das Christ-Elflein ("The Little Elf of Christ") is an opera in two acts by Hans Pfitzner to a German-language libretto by Pfitzner and Ilse von Stach.
 The work was originally premiered in 1906 as a Christmas play by von Stach with incidental music by Pfitzner.
 It was later revised by the composer into a two-act opera (the version performed today) which premiered in Dresden on 11 December 1917.
Die Rose vom Liebesgarten is a 1900 opera by Hans Pfitzner to a libretto by James Grun, one of Pfitzner's fellow students at the Frankfurt Conservatory, which had been prompted by an 1890 painting by Hans Thoma "Der Wächter vor dem Liebesgarten".
Semyon Kotko (Russian: Семён Котко ), Op. 81, is an opera in five acts by Sergei Prokofiev to a libretto by Sergei Prokofiev and Valentin Katayev based on Katayev's 1937 novel "I, Son of Working People" (Russian: Я, сын трудового народа… ).
 It was premiered on 23 June 1940 at the Stanislavsky Opera Theatre in Moscow.

Question: Who was born first, Hans Pfitzner or Sergei Prokofiev?
Answer: Hans Erich Pfitzner