Editing Gregorian chant (section)

===Proper chants of the Mass===
The Introit, Gradual, Alleluia, Tract, Sequence, Offertory and Communion chants are part of the [[Proper (liturgy)|Proper]] of the Mass. "Proprium Missae" in Latin refers to the chants of the Mass that have their proper individual texts for each Sunday throughout the annual cycle, as opposed to 'Ordinarium Missae' which have fixed texts (but various melodies) (Kyrie, Sanctus, Benedictus, Agnus Dei).

[[Introit]]s cover the procession of the officiants. Introits are antiphonal chants, typically consisting of an antiphon, a psalm verse, a repeat of the antiphon, an intonation of the Gloria Patri [[Doxology]], and a final repeat of the antiphon. [[Reciting tone]]s often dominate their melodic structures.

[[Gradual]]s are responsorial chants that follow the reading of the [[Epistle]]. Graduals usually result from ''[[centonization]]''; stock musical phrases are assembled like a patchwork to create the full melody of the chant, creating families of musically related melodies. Graduals are accompanied by an elaborate Verse, so that it actually consists in two different parts, A B. Often the first part is sung again, creating a 'rondeau' A B A. At least the verse, if not the complete gradual, is for the solo cantor and are in elaborate, ornate style with long, wide-ranged melismata.

The [[Alleluia]] is known for the ''[[jubilus]]'', an extended joyful melisma on the last vowel of 'Alleluia'. The Alleluia is also in two parts, the alleluia proper and the psalmverse, by which the Alleluia is identified (Alleluia V. Pascha nostrum). The last melisma of the verse is the same as the jubilus attached to the Alleluia. Alleluias are not sung during penitential times, such as [[Lent]]. Instead, a [[Tract (liturgy)|Tract]] is chanted, usually with texts from the Psalms.

[[Sequence (poetry)|Sequences]] are sung poems based on couplets. Although many sequences are not part of the liturgy and thus not part of the Gregorian repertory proper, Gregorian sequences include such well-known chants as ''[[Victimae paschali laudes]]'' and ''[[Veni Sancte Spiritus]]''. According to [[Notker Balbulus]], an early sequence writer, their origins lie in the addition of words to the long melismata of the jubilus of Alleluia chants.{{sfn|Crocker|1977|pp=1–2}}