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Gregorio is not a completely independent program, but consists mainly of three components: The gabc syntax for writing Gregorian scores, a TeX package named GregorioTeX, which is responsible for the graphical output and a converter tool between those two. As such, Gregorio is included in TeX Live 2016.
Gregorio is written especially for Gregorian chant in square notation and does not cover modern European musical notation. Similar to LilyPond it does not provide a graphical user interface. The notation is done via simple text input. It follows the gabc-syntax, which is defined by the Gregorio Project for this purpose. The gregorio command line tool converts this gabc-file to a GregorioTeX file, which has to be included in a common TeX file. Such a file is necessary for a graphical output, e.g., in the PDF-format.
At first, the goal of the project was just to provide the Benedictine Abbey Sainte Madeleine in Le Barroux a graphical interface for the usage of a Gregorian font. Due to license issues, the project decided later to make and use its own font. At the end of 2006, a new developer, Olivier Berten, joined the project and created its OpusTeX component. OpusTeX was a LaTeX package with a similar goal like Gregorio but is now unmaintained and deprecated. During a three-month internship, starting in April 2008, at the Monastero di San Benedetto, in Norcia (Italy), Gregorio made considerable progress and its own output named GregorioTeX started to be usable.
In following years Gregorio gained stability and popularity, strongly supported by the migration to GitHub in June 2014. Making contributions got much easier, therefore the development progress became faster. New feature like the adiastematic Saint Gall notation through nabc were implemented. Gregorio was adopted by many abbeys and large projects. The most prominent user may be the St. Peters's Abbey of Solesmes.
In 2016 Gregorio should be integrated into TeX Live, which would make the installation process even more easy.
Example of Gregorio input files
For producing a score in the PDF format it is suitable to use two separate files -- one gabc file and one TeX file. The musical notation is done in the gabc-file with the related gabc syntax. The TeX file could look like this (with the gabc-file named "kyrie.gabc" in the same directory):
The first lines contain metainformation such as the name of the chant, the appropriate place in the liturgy of the mass or the Liturgy of the Hours, the original source or the copyright of the score. Sung text and notes are not, as in Lilypond syntax, separated, but the notes are written in parentheses right after the corresponding syllable. A short overview of the syntax is provided by a cheat sheet. If both the TeX and the gabc file are in the same directory, one has just to compile the tex-file with lualatex --shell-escape kyrie.tex.
Reception and usage
Gregorio is the leading program on its area and widely used. It is considered to be the main specialist on the field of music engraving software.