Trope (music)
See also: Trope
In Gregorian chant, a trope is a musical increase, which consists in putting artificial words on Mélisme S, to facilitate memorizing of it.
The tropes (which were not sung, but simply memorized) are at the origin of the Séquence S, initially formed by the trope of the melism of the Alléluia, which had ended up being sung in the form of parts with whole share at the end of the Moyen-âge.
The process practically disappeared with the invention from the musical notation, and does not remain any more but by the " under-titers" data at piece-rates of the kyriale ( lux and origo , cunctipotens , orbis Factor ,…), which is (at the origin) the first words of the trope corresponding.
A tropaire is a collection of liturgical songs noted in the form of tropes.
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