Alexis Emmanuel Chabrier (] ; January 18, 1841September 13, 1894) was a French Romantic composer and pianist.
 Although known primarily for two of his orchestral works, "España" and "Joyeuse marche", he left an important corpus of operas (including "L'étoile"), songs, and piano music.
 He was admired by composers as diverse as Debussy, Ravel, Richard Strauss, Satie, Schmitt, Stravinsky, and the group of composers known as Les six.
 Stravinsky alluded to "España" in his ballet "Petrushka"; Gustav Mahler called "España" "the beginnings of modern music" and alluded to the "Dance Villageoise" in the "Rondo Burleske" movement of his Ninth Symphony.
 Ravel wrote that the opening bars of "Le roi malgré lui" changed the course of harmony in France, Poulenc wrote a biography of the composer, and Richard Strauss conducted the first staged performance of Chabrier's incomplete opera "Briséïs".
The Messa per Rossini is a Requiem Mass composed to commemorate the first anniversary of Gioachino Rossini's death.
 It was a collaboration among 13 Italian composers, initiated by Giuseppe Verdi.
 The composition was intended to be performed on 13 November 1869 in the Basilica of San Petronio, Bologna, where Rossini grew up and spent a large part of his life.
Menuet antique is a piece for solo piano composed by Maurice Ravel.
 The original piano version was written in 1895 and orchestrated by the composer in 1929.
 Ravel wrote the piece to pay tribute to Emmanuel Chabrier, who had welcomed his early works and helped to establish his musical reputation.
Gioachino Antonio Rossini (] ; 29 February 179213 November 1868) was an Italian composer who wrote 39 operas, as well as some sacred music, songs, chamber music and piano pieces.
This is a list of the operas of the Italian composer Gioachino Rossini (1792–1868).
 See List of compositions by Gioachino Rossini for his other works.
Guillaume Tell (English: William Tell , Italian: Guglielmo Tell ) is a French opera in four acts by Gioachino Rossini to a libretto by Étienne de Jouy and Hippolyte Bis.
 Based on Friedrich Schiller's play "William Tell," which drew on the William Tell legend, the opera was Rossini's last, although he lived for nearly forty more years.
 Fabio Luisi said that Rossini planned for "William Tell" to be his last opera even as he composed it.
 The overture, in four sections and featuring a depiction of a storm as well as a vivacious finale, the "March of the Swiss Soldiers," is often played.
Bar aux Folies-Bergère is a one-act ballet created in 1934, with scenario and choreography by Ninette de Valois, and designs by William Chappell after Manet.
 The music consists of piano works by Emmanuel Chabrier, selected and arranged by Constant Lambert.
Péchés de vieillesse ("Sins of Old Age") is a collection of 150 vocal and solo piano pieces by composer Gioachino Rossini, who was best known for his operas.
 The pieces are grouped into fourteen unpublished albums under this self-deprecating and ironic title.
 The ordering of the pieces in the albums does not reflect the sequence or the dates of their composition, which range from 1857 to shortly before Rossini's death in 1868.
 The title "Péchés de vieillesse" was given by Rossini only to volumes V-IX, but has since been extended to the complete set.
Rossini (also known as "Arte ed amori di Gioacchino Rossini") is a 1942 Italian musical drama film directed by Mario Bonnard and starring Nino Besozzi, Paola Barbara, Camillo Pilotto, Armando Falconi and Greta Gonda.
 It depicts adult life events of Italian composer Gioachino Rossini.
Gwendoline is an opera in two acts and three scenes by the French composer Emmanuel Chabrier, with a libretto by Catulle Mendès.
 It was first performed at the Théâtre de la Monnaie, Brussels, Belgium on 10 April 1886.
 Further performances followed in Karlsruhe in 1889, Leipzig in 1890 and then in Lyons and Paris in 1893.
 "Gwendoline" was Chabrier's attempt to write a serious opera in the style of Richard Wagner.

Question: Gioachino Rossini and Emmanuel Chabrier both wrote what type of music?
Answer: opera