<P> Conversely, they omit significative letters found in the original sources, which give instructions for rhythm and articulation such as speeding up or slowing down . These editorial practices has placed the historical authenticity of the Solesmes interpretation in doubt . Ever since restoration of Chant was taken up in Solesmes, there have been lengthy discussions of exactly what course was to be taken . Some favored a strict academic rigour and wanted to postpone publications, while others concentrated on practical matters and wanted to supplant the corrupted tradition as soon as possible . Roughly a century later, there still exists a breach between a strict musicological approach and the practical needs of church choirs . Thus the performance tradition officially promulgated since the onset of the Solesmes restoration is substantially at odds with musicological evidence . </P> <P> In his motu proprio Tra le sollecitudini, Pius X mandated the use of Gregorian chant, encouraging the faithful to sing the Ordinary of the Mass, although he reserved the singing of the Propers for males . While this custom is maintained in traditionalist Catholic communities (most of which allow all - female scholas as well, though), the Catholic Church no longer persists with this ban . Vatican II officially allowed worshipers to substitute other music, particularly sacred polyphony, in place of Gregorian chant, although it did reaffirm that Gregorian chant was still the official music of the Roman Rite of the Catholic Church, and the music most suitable for worship in the Roman Liturgy . </P> <P> Gregorian chant is, as' chant' implies, vocal music . The text, the phrases, words and eventually the syllables, can be sung in various ways . The most straightforward is recitation on the same tone, which is called "syllabic" as each syllable is sung to a single tone . Likewise, simple chants are often syllabic throughout with only a few instances where two or more notes are sung on one syllable . "Neumatic" chants are more embellished and ligatures, a connected group of notes, written as a single compound neume, abound in the text . Melismatic chants are the most ornate chants in which elaborate melodies are sung on long sustained vowels as in the Alleluia, ranging from five or six notes per syllable to over sixty in the more prolix melismata . </P> <Table> <Tr> <Td> </Td> <Td> Epistle for the Solemn Mass of Easter Day Example of liturgical recitative in Gregorian chant </Td> </Tr> <Tr> <Td_colspan="2"> Problems playing this file? See media help . </Td> </Tr> </Table>

A gregorian chant that features one note per syllable is melismatic
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