The requiem mass depends in large part for its format on the whims of the
	composer and differs from the ordinary mass in several ways. This page
	purports to enumerate the variety and differences as well as furnish the
	text of several, seminal requiems in history and make other, useful comments.
	
	
	The word requiem itself is Latin
	(feminine noun, requies, -etis),
	means “rest,” and is taken out of the mass itself from the
	first word of the Introit, “Requiem æternam”
	(“rest eternal”), or the phrase,
	“Dona eis requiem” (“[Lord] grant them rest”).
	This is mass is associated, therefore, with the death of a person or persons.
	Typically, a requiem begins with the Introitus, uses much the same
	texts as the ordinary mass, but almost always omits the more joyful texts
	(such as the Gloria) and sometimes the Credo. It almost
	always includes the flamboyant Dies iræ (“day of
	wrath”).
	
	
	In the ordinary mass, the worship service practiced by communicants in the
	Roman and Anglican churches on a more or less weekly basis throughout the
	year, certain textual parts depend upon the day within a liturgical year*,
	thus vary and therefore aren’t chosen willy nilly by the composer
	of the mass. However, in a requiem mass, which is concerned less with liturgy
	and more with the singular event of a person’s death, these parts can
	be more freely chosen and structured by the composer.
	
	
	(The “liturgical year” refers to the emphasis placed on
	commemoration of important events whose anniversaries are traditionally
	observed such as Lent and Easter in the spring and Advent and Christmas in
	December.)
	
	
	The various parts of a mass take their name from a first or oft-repeated
	phrase in their text, as already noted, an example of this is found in the
	Introit, the words of which give its name to the mass, and the
	repetition of the phrase that gives this mass its name.
	
	
	
	Another example can be found in the Agnus Dei in which words giving
	the name of requiem to the mass, to wit “Dona eis requiem,” are
	substituted for the ordinary plea of “Miserere nobis” or
	“[Lord] have mercy upon us.” Also in the Agnus Dei, the
	phrase “Dona nobis pacem” (“[Lord] grant us peace”)
	is changed to “Dona eis requiem sempiternam” (“[Lord] grant
	them rest eternal”).
	
	
	Although most of the requiem mass is set to the original Latin text of the
	ordinary mass, composers tend to flavor their requiems by the choice of
	texts from outside the mass, by the language employed, whether they stick to
	the Latin text or make use of a modern tongue, as well as by composing whole,
	new texts.
	
	
	Note that some requiem masses, particularly some composed starting in the
	XVIIIth century, are purely musical compositions or concert requiems
	since their length or the number of singers and orchestra members needed to
	perform them would prohibit their use in a worship or funeral setting.
	
	 Structure and Composition 
	
	The requiem mass consists of a number of sections each having a name that
	describes the section or moment in the mass, or that is the first line or
	other principal wording of that section (here, in italics). These comments
	become more interesting as you examine the text of the various requiems I
	include here.
	
	
		-  Requiem æternam, the opening lines of the
					requiem mass are based on a passage from an apocryphal book
					(nevertheless contained in most if not all editions of the
					Catholic Bible), 4 Esdras ii.34,35:
					|  | “Await your shepherd; he will give you everlasting rest
					... Be ready for the rewards of the Kingdom, because the eternal
					light will shine upon you for evermore.” |  |  
 as well as on Psalm lxv.1,2 (not the King James translation):|  | “Praise is due to thee, O God, in Zion; and to thee shall
					vows be performed. O thou who hearest prayer! To thee shall all
					flesh come on account of sins.” |  |  
 It must also be noted that Zion is the citadel of Jerusalem
					taken by David from the Jebusites (2 Samuel v.6,7), the name
					signifying God’s holy mount (Psalm ii.6) as well as the
					city itself (Isaiah i.27). Zion is symbolic of the point on
					earth between God and men from which holiness and salvation
					radiates.
-  Kyrie eleison (“Lord have mercy”), the
					only text in the mass to be sung in Greek; I have never learned
					why this is.
		
-  Gradual, a name given to a vocal piece that is often sung
					by a chorale while standing on steps in a church (from Latin
					gradus, “steps”)
		
-  Tract, “Forgive us our sins, O Lord,” obviously a
					preoccupation with the need to purify oneself prior to entering
					the next world.
		
-  Sequentia or Dies iræ (“day of
					wrath”), not incorporated into the
					mass itself until the XIVth century; its authorship is in doubt,
					but mostly attributed to the Franciscan order, possibly Thomas
					of Celano (1200-55), friend and biographer of St. Francis. The
					text is inspired in part by the Libera me sung at the
					Absolution following the mass which comes from impressively
					graphic verses of Zephania i.14-17:
					|  | The great day of the LORD is near, it is near, and hasteth
					greatly, even the voice of the day of the LORD: the mighty man
					shall cry there bitterly. That day is a day of wrath, a day of
					trouble and distress, a day of wasteness and desolation, a day
					of darkness and gloominess, a day of clouds and thick darkness,
					A day of the trumpet and alarm against the fenced cities, and
					against the high towers. And I will bring distress upon men,
					that they shall walk like blind men, because they have sinned
					against the LORD: and their blood shall be poured out as dust,
					and their flesh as the dung. |  |  
 More inspiration might be found in the VIIth century Advent
					hymn, Apparebit repentina dies magna Domini (“The
					great day of the Lord will suddenly appear”) and from
					2 Peter iii.7-11, Psalm icvii.1-6 and Matthew xxv.41-46.
					The Dies iræ is a personal meditation on the Gospel
					for the First Sunday of Advent, Luke xxi.25-36, and its first
					liturgical use was probably for that day. The
					Dies iræ has
					no real place in the mass and as it’s cast in first person
					singular, it violates the otherwise third person norm of the
					liturgy which should be concerned with the whole of the people
					and not one person. However, a requiem mass is often
					personalized and the wildly graphic imagery of the Dies
					iræ makes it a favorite. Especially by reason of the last
					six lines, of which the first four are taken from a hymn at
					least as old as the XIIth century, this section was adapted.
-  Offertory, theologically amiss, appears to derive
					from a Coptic rite where the reference to Saint Michæl is
					in accordance with what is known of Egyptian iconographical art
					depicting the Archangel weighing the merits of the dead
					(specifically to be confused with the more modern popular notion
					of employing Saint Peter at the gate of Heaven). See Daniel x.13
					and xii.1 as well as Genesis xi.26,18. Michæl’s name
					is linked to that of Abraham.
		
-  Sanctus, see comment for the ordinary mass below.
		
-  Pie Jesu Domine, petition addressed to the Lord Jesus
					Christ in favor of the dead.
		
-  Agnus Dei, see comment for the ordinary mass below.
		
-  Communion (self-explanatory).
		
-  Exsequiæ, “Deliver me, O Lord.”
		
-  Valedictio, literally the “fare thee well”
					of the mass. Of the masses I cover here, Fauré’s
					has this.
	
	A more complete choice of requiem texts including
	the sources of all or most of Mozart’s text may be found by clicking
	on this sentence.
	
	 A Brief Note on the Structure and Composition of the Ordinary Mass 
	
	A full mass consists of the following six sections which can be compared to
	the requiem mass:
	
	
		-  Kyrie eleison, in Greek: “Lord, have mercy; Christ,
					have mercy.”
		
-  Gloria, celebratory passage praising God.
		
-  Credo, more or less a setting of the Nicene Creed.
		
-  Sanctus, the doxology praising God’s holiness.
		
-  Benedictus, continuing the Sanctus, “Blessed is He who
					comes in the name of the Lord.”
		
-  Agnus Dei, invocation of the Lamb of God beseeching
					His mercy.
	
	Sometimes other sections oriented toward liturgy, often motets or even
	Gregorian chants and other musical compositions are added. Below are the
	texts of several requiem masses to compare and contrast.
	
	
	
	Other famous requiem masses include compositions from Belioz’
	(Grande messe des morts), Giuseppe Verdi,
	Benjamin Britten (War Requiem) and Andrew Lloyd Webber.
	
	 Requiem Mass Composers by Period 
	
	A Wikipedia article lists the following composers as known to have created
	requiem masses whether still extant or not.
	
	
		-  Renaissance
			
				-  Giovanni Francesco Anerio
				
-  Giammeteo Asola
				
-  Giulio Belli
				
-  Antoine Brumel
				
-  Manuel Cardoso
				
-  Joan Cererols
				
-  Pierre Certon
				
-  Clemens non Papa
				
-  Guillaume Dufay (lost!)
				
-  Pedro de Escobar
				
-  Antoine de Févin
				
-  Francisco Guerrero
				
-  Jacobus de Kerle
				
-  Orlande de Lassus
				
-  Jean Maillard
				
-  Jacques Mauduit
				
-  Manuel Mendes
				
-  Cristóbal de Morales
				
-  Johannes Ockeghem (earliest to survive!)
				
-  Giovanni Pierluigi da Palestrina
				
-  Costanzo Porta
				
-  Johannes Prioris
				
-  Jean Richafort
				
-  Pierre de la Rue
				
-  Claudin de Sermisy
				
-  Jacobus Vaet
				
-  Tomás Luis de Victoria
			
 
-  Baroque
			
				-  Heinrich Ignaz Franz von Biber
				
-  Marc-Antoine Charpentier
				
-  Jean Gilles
				
-  Claudio Monteverdi (lost!)
				
-  Michael Prætorius
				
-  Heinrich Schütz
				
-  Jan Dismas Zelenka
			
 
-  Classical
			
				-  Wolfgang Amadeus Mozart
				
-  Luigi Cherubini
				
-  Florian Leopold Gassmann
				
-  François-Joseph Gossec
				
-  Michael Haydn
				
-  Andrea Luchesi
			
 
-  Romance Era
			
				-  Anton Bruckner
				
-  Carl Czerny
				
-  Antonín Dvorák
				
-  Gabriel Fauré
				
-  Charles Gounod
				
-  Franz Liszt
				
-  Camille Saint-Saëns
				
-  Robert Schumann
				
-  Charles Villiers Stanford
				
-  Giacomo Rossini
			
 
-  Post-romance/Contemporary
			
				-  Maurice Duruflé
				
-  Herbert Howells
				
-  Karl Jenkins
				
-  György Ligeti
				
-  Frank Martin
				
-  Krzysztof Penderecki
				
-  Jocelyn Pook
				
-  Zbigniew Preisner
				
-  John Rutter
				
-  Alfred Schnittke
				
-  Robert Steadman
				
-  Igor Stravinsky
				
-  Toru Takemitsu
				
-  John Tavener
				
-  Liva
				
-  Mack Wilberg