Question: Igor Stravinsky and Richard Wagner were both influential composers in what era?

Context paragraphs:
Neo-romanticism: The term neo-romanticism is used to cover a variety of movements in philosophy, literature, music, painting, and architecture, as well as social movements, that exist after and incorporate elements from the era of Romanticism.  It has been used with reference to late-19th-century composers such as Richard Wagner particularly by Carl Dahlhaus who describes his music as "a late flowering of romanticism in a positivist age".  He regards it as synonymous with "the age of Wagner", from about 1850 until 1890—the start of the era of modernism, whose leading early representatives were Richard Strauss and Gustav Mahler .  It has been applied to writers, painters, and composers who rejected, abandoned, or opposed realism, naturalism, or avant-garde modernism at various points in time from about 1840 down to the present.

Suvini Zerboni: Suvini Zerboni (ESZ) Italian music publishing house founded in 1907 in Milan, taking its name from the theater society of the same name.  The ESZ catalogue included, besides operetta favourites, the best of Italian contemporary music, such composers as Goffredo Petrassi, Luigi Dallapiccola, Luciano Berio, Ildebrando Pizzetti, and Gian Francesco Malipiero.  Since the 1950s, ESZ has been the Italian agent of Schott Music, representing composers such as Igor Stravinsky, Carl Orff, Paul Hindemith, Richard Strauss, Luigi Nono, Krzysztof Penderecki and Joaquín Rodrigo.  The ESZ catalalogue of modern Italian composers active since the 1970s is extensive.  ESZ also publishes the bulletin “ESZ News” with information on the activities and performances of its composers.  Until 1999 ESZ published "Il Fronimo", the guitar magazine founded by Ruggero Chiesa in 1972, and "La Cartellina", a magazine on choral and pedagogical music, founded by Roberto Goitre in 1977 and subsequently headed by Giovanni Acciai.

Tony Palmer: Tony Palmer (born 29 August 1941 in London) is a British film director and author.  His work includes over 100 films, ranging from early works with The Beatles, Cream, Jimi Hendrix, Rory Gallagher ("Irish Tour '74") and Frank Zappa ("200 Motels"), to his classical portraits which include profiles of Maria Callas, Margot Fonteyn, John Osborne, Igor Stravinsky, Richard Wagner, Yehudi Menuhin, Carl Orff, Benjamin Britten and Ralph Vaughan Williams.  He is also a stage director of theatre and opera.

Igor Stravinsky: Igor Fyodorovich Stravinsky (sometimes spelled "Strawinski", "Strawinsky", or "Stravinskii"; Ukrainian: І́гор Фе́дорович Страві́нський , ] ;Russian: И́горь Фёдорович Страви́нский , "Igorʹ Fëdorovič Stravinskij"; ] ; 17 June [O.S. 5 June] 1882 6 April 1971) was a Russian Empire-born composer, pianist, and conductor.  He is widely considered one of the most important and influential composers of the 20th century.

Thomas Rajna: His first commercial recording was the complete piano solo works of Igor Stravinsky.  Since then he has recorded music by Alexander Scriabin, Robert Schumann and Olivier Messiaen, the piano part of Igor Stravinsky's "Petrushka" with the New Philharmonia under Erich Leinsdorf, and Béla Bartók's "Music for Strings, Percussion and Celesta" with Sir Georg Solti and the London Symphony Orchestra.  He has completed a cycle of recordings devoted to the entire piano music of Enrique Granados.  Subsequently he undertook to record Franz Liszt's 12 "Transcendental Etudes" and "12 Etudes", Op. 1.  Rajna has often performed his own two piano concertos.

Twelve-tone technique: Twelve-tone technique—also known as dodecaphony, twelve-tone serialism, and (in British usage) twelve-note composition—is a method of musical composition devised by Austrian composer Arnold Schoenberg (1874–1951) and associated with the "Second Viennese School" composers, who were the primary users of the technique in the first decades of its existence.  The technique is a means of ensuring that all 12 notes of the chromatic scale are sounded as often as one another in a piece of music while preventing the emphasis of any one note through the use of tone rows, orderings of the 12 pitch classes.  All 12 notes are thus given more or less equal importance, and the music avoids being in a key.  Over time, the technique increased greatly in popularity and eventually became widely influential on 20th century composers.  Many important composers who had originally not subscribed to or even actively opposed the technique, such as Aaron Copland and Igor Stravinsky, eventually adopted it in their music.

Richard Wagner: Wilhelm Richard Wagner ( ; ] ; 22 May 181313 February 1883) was a German composer, theatre director, polemicist, and conductor who is primarily known for his operas (or, as some of his later works were later known, "music dramas").  Unlike most opera composers, Wagner wrote both the libretto and the music for each of his stage works.  Initially establishing his reputation as a composer of works in the romantic vein of Weber and Meyerbeer, Wagner revolutionised opera through his concept of the "Gesamtkunstwerk" ("total work of art"), by which he sought to synthesise the poetic, visual, musical and dramatic arts, with music subsidiary to drama.  He described this vision in a series of essays published between 1849 and 1852.  Wagner realised these ideas most fully in the first half of the four-opera cycle "Der Ring des Nibelungen" ("The Ring of the Nibelung").

Concerto in E-flat &quot;Dumbarton Oaks&quot;: Concerto in E-flat, subtitled Dumbarton Oaks 8-v-1938 (1937–38) is a chamber concerto by Igor Stravinsky, named for the Dumbarton Oaks estate of Robert Woods Bliss and Mildred Barnes Bliss in Washington, DC, who commissioned it for their thirtieth wedding anniversary.  Composed in Stravinsky's neo-classical period, the piece is one of Stravinsky's two chamber concertos (the other being the Concerto in D, for strings, 1946) and is scored for a chamber orchestra of flute, B♭ clarinet, bassoon, two horns, three violins, three violas, two cellos, and two double basses.  The three movements, Tempo giusto, Allegretto, and Con moto, performed without a break, total roughly twelve minutes.  The concerto was heavily inspired by Bach's set of Brandenburg Concertos, and was the last work Stravinsky completed in Europe, started in spring 1937 at the Château de Montoux near Annemasse, near Geneva, Switzerland, and finished in Paris on March 29, 1938 .

Jane Henschel: Jane Henschel (born 2 March 1952) is an American operatic mezzo soprano.  Henschel, who was born in Wisconsin, studied at the University of Southern California, and then pursued further studies in Germany, where she has made her home.  Her numerous opera appearances include Baba the Turk in Igor Stravinsky's "The Rake’s Progress" with Glyndebourne Festival Opera, the Saito Kinen Festival Matsumoto, and the Salzburg festival; Brangäne in Richard Wagner’s "Die Walküre" with Paris Opéra and the Los Angeles Opera; the Principessa in Giacomo Puccini’s "Suor Angelica" with conductor Riccardo Chailly and the Royal Concertgebouw Orchestra; Blanche de la Force in Francis Poulenc’s "Dialogues des Carmélites" in Amsterdam; Kostelnicka Buryjovka in Leoš Janáček’s "Jenůfa" under Seiji Ozawa in Japan; and the Kabanicka in Janáček’s "Katya Kabanova" at the Salzburg Festival among others.

Stravinsky Fountain: The Stravinsky Fountain (French:" La Fontaine Stravinsky") is a whimsical public fountain ornamented with sixteen works of sculpture, moving and spraying water, representing the works of composer Igor Stravinsky.  It was created in 1983 by sculptors Jean Tinguely and Niki de Saint Phalle, and is located on Place Stravinsky, next to the Centre Pompidou, in Paris.

Supporting paragraphs: Igor Stravinsky Richard Wagner
Answer: 20th century