Title: Mass (music)
Content: Requiem Mass by Herbert Howells ; Requiem by Maurice Duruflé ; Mass in G by Francis Poulenc ; Messe Solennelle by Jean Langlais ; Glagolitic Mass (1926) by Leoš Janáček ; Mass in G minor by Ralph Vaughan Williams ; Mass, Op. 130 for choir and brass by Joseph Jongen (1945) ; Requiem by Bruno Maderna (1946) ; Mass by Igor Stravinsky ; Mass by Leonard Bernstein ; War Requiem by Benjamin Britten ; Mass for mixed chorus (1963) by Paul Hindemith ; Requiem, for soprano and mezzo-soprano solo, mixed chorus and orchestra (1963–65) by György Ligeti ; Requiem by Andrew Lloyd Webber ; Mass in F Minor by The Electric Prunes ; Mass by David Maslanka ; Mass Of The Sea, Op. 
Title: Mass (Stravinsky)
Content:  Igor Stravinsky composed his Mass between 1944 and 1948. This 19-minute setting of the Roman Catholic Mass exhibits the austere, Neoclassic, anti-Romantic aesthetic that characterizes his work from about 1923 to 1951. The Mass also represents one of only a handful of extant pieces by Stravinsky that was not commissioned. As such, part of the motivation behind its composition has been cited by Robert Craft and others as the product of a spiritual necessity.
Title: Mass (Bernstein)
Content:  Mass (formally: MASS: A Theatre Piece for Singers, Players, and Dancers) is a musical theatre work composed by Leonard Bernstein with text by Bernstein and additional text and lyrics by Stephen Schwartz. Commissioned by Jacqueline Kennedy, it premiered on September 8, 1971, conducted by Maurice Peress and choreographed by Alvin Ailey. The production used costume designs by Frank Thompson. The performance was part of the opening of the John F. Kennedy Center for the Performing Arts in Washington, D.C. Mass premiered in Europe in 1973, with John Mauceri conducting the Yale Symphony Orchestra in Vienna. Originally, Bernstein had intended to compose a traditional Mass, but instead 
Title: Mass (music)
Content:  The Mass (missa), a form of sacred musical composition, is a choral composition that sets the invariable portions of the Eucharistic liturgy (principally that of the Catholic Church, the Anglican Communion, and Lutheranism) to music. Musical Masses take their name from the Catholic liturgy called "the Mass". Most Masses are settings of the liturgy in Latin, the liturgical sacred language of the Catholic Church's Roman Rite, but there are a significant number written in the languages of non-Catholic countries where vernacular worship has long been the norm. For example, there have been many Masses written in English for a United States context since the Second Vatican Council, and others (often called "communion services") for the Church of England. Masses can be a cappella, that is, without an independent accompaniment, or they can be accompanied by instrumental obbligatos up to and including a full orchestra. Many masses, especially later ones, were never intended to be performed during the celebration of an actual mass.
Title: Mass (music)
Content:  they were canonic masses, as in Josquin's Missa sine nomine. Many famous and influential masses were composed by Josquin des Prez, the single most influential composer of the middle Renaissance. At the end of the 16th century, prominent representatives of a cappella choral counterpoint included the Englishman William Byrd, the Castilian Tomás Luis de Victoria and the Roman Giovanni Pierluigi da Palestrina, whose Missa Papae Marcelli is sometimes credited with saving polyphony from the censure of the Council of Trent. By the time of Palestrina, however, most composers outside of Rome were using other forms for their primary creative outlet for expression in the realm of sacred 
Title: List of Catholic musicians
Content:  at St Mark's Basilica and composed numerous Masses. ; Olivier Messiaen, twentieth century French composer. "Many of his compositions depict what he termed 'the marvellous aspects of the faith', drawing on his unshakeable Roman Catholicism." ; Claudio Monteverdi, Italian composer, famous from madrigals, and important in the transition from Renaissance to Baroque styles. Most well-known sacred piece is Vespro della Beata Vergine 1610 (Vespers for the Blessed Virgin) and was ordained in 1633 ; Stephen Moreno, Benedictine missionary to New Norcia in Australia who composed Masses published in Europe. ; Wolfgang Amadeus Mozart, composed 18 Masses including the Requiem Mass, the Coronation Mass, and the Great Mass in 
Title: Mass in G major, K. 140 &quot;Pastoral&quot;
Content:  Ludwig von Köchel, in the first edition of his catalog of Mozart's music, thought the Mass roughly contemporary with Lucio Silla and "Exsultate, jubilate" (1772-1773). Alfred Einstein thought its original composition to be closer to that of the sixth Serenade (1776) with his revision of Köchel's catalog in 1937. Otto Jahn, Franz Giegling and others thought it not to be by Mozart at all. The work was accepted as genuine by Walter Senn: he published the Mass as No. 5 in the Neue Mozart-Ausgabe in 1968. The earliest surviving score and parts, found in a cloister in Augsburg, Germany, were prepared by a copyist, with completions and corrections in Mozart's hand. Senn assumes the Mass was composed in 1773, after Mozart had returned from Italy in March.
Title: Mass in G major (Poulenc)
Content: I Kyrie (Animé et très rythmé) ; II Gloria (Très animé) ; III Sanctus (Très allant et doucement joyeux) ; IV Benedictus (Calme mais sans lenteur) ; V Agnus Dei (Très pur, très clair et modéré) Poulenc turned to sacred music first in 1937 when he composed the mass Messe en sol majeur. He dedicated it to the memory of his father who had died some years before. He set all the parts of the Latin mass, with the exception of the Credo, in 1937, scored for a soprano soloist and a mixed choir a cappella. As he omitted the Credo, it is technically a missa brevis, in five movements: The choral writing for unaccompanied choir has been described as of "cool purity". The first performance was sung in Paris on 3 April 1938 by Les Chœurs de Lyon. There are numerous recordings of the mass; the earliest may be a ca.1940 recording on 78 rpm of Les Chanteurs de Lyon (another name for Les Chœurs de Lyon, according to BNF) conducted by Ernest Bourmauck between 1934 and 1942 when he was succeeded by André Cluytens.
Title: List of Catholic musicians
Content:  ; Joseph Haydn, great Austrian composer of the Classical period. Credited with inventing the symphony. Also composed 14 Masses (including the Mass in Time of War), 2 Te Deums and a Stabat Mater. Very devout, often prayed the rosary when he had trouble composing. Teacher of both Mozart and Beethoven. ; Zoltán Kodály, twentieth century Hungarian composer. Composed a Missa Brevis, a Te Deum, and Psalmus Hungaricus. ; Guglielmo Enrico Lardelli An Italian-Australian who composed secular and liturgical works. ; Franz Liszt, famed pianist and Romantic composer, mostly of piano works. He became a Franciscan tertiary. Composed much sacred music, including 5 masses. ; Antonio Lotti, made his 
Title: Mass in C major (Beethoven)
Content:  Ludwig van Beethoven composed the Mass in C major, Op. 86, to a commission from Prince Nikolaus Esterházy II in 1807. The mass, scored for four vocal soloists, choir and orchestra, was premiered that year by the Prince's musical forces in Eisenstadt. Beethoven performed parts of it in his 1808 concert featuring the premieres of four major works including his Fifth Symphony. The mass was published in 1812 by Breitkopf & Härtel. Both the Prince and contemporary critic E. T. A. Hoffmann were generally displeased by the work, though the latter still considered it "entirely worthy of the great master [because of its] inner structure [and] intelligent orchestration". The work has since been overshadowed by the later and better known Missa solemnis, though critics such as Michael Moore have noted the Mass in C major's superiority in "directness and an emotional content".

Question: Who was the composer of Mass?
Answer: Leonard Bernstein.
Louis Bernstein.