Idiomelon

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Idiomelon is a type of sticheron (a liturgical hymn) with its own, original melody. The word comes from Greek meaning “own melody.” These unique melodies were written down in chant books and are tied to the eight-mode cycle of the Byzantine musical system, the octoechos.

In this system there are three related ideas:
- Idiomelon: a hymn that has its own distinct tune, not borrowed from another melody.
- Avtomelon (also spelled avtomelon or aftomelon): a melody used as a model or template. Other hymns can be composed to fit this melody and its rhythmic pattern.
- Prosomion (prosomoia): a hymn that is set to the melody of an avtomelon. The text is new, but the music is borrowed from the avtomelon and adapted to the verse’s meter and accents.

So the hymn repertoire includes melodies with their own idiomela, and others that are built by fitting texts to existing melodies (prosomoia), sometimes using a common melodic model (avtomela).

Key chant books and ideas:
- The melodies were organized by the octoechos, the eight musical modes used in Byzantine chant.
- Important notated books include the Sticherarion, Menaion, Triodion, Pentecostarion, and Parakletike. Slavonic versions of these traditions called idiomela samoglasniy.
- Prosomoia were written in instructional books such as the Octoechos and Parakletike, and in some cases notated alongside sticheraria. They show how automelon melodies were adapted to new texts.
- Avtomela served as melodic models for many hymns, including those later used as the basis for kontakia and other forms.

Historical context:
- From the early centuries, monastic communities developed the octoechos and a reform movement (Studites, Sinai) that brought more formal notation.
- By the end of the first millennium, composers wrote many idiomela, while many hymns used existing melodies (avtomela) as models for new texts (prosomoia).
- In Slavic regions (like Ohrid, Novgorod, and Moscow), translators and singers adapted the system to local languages. Some traditions used carefully notated idiomela, while others relied on simpler avtomela with translated prosomoia.
- In the 18th century, reform refined chant into newer, more regular styles (Neobyzantine octoechos) that influence modern practice. Some northern traditions, such as Valaamskiy rozpev, emphasize repeating melodic patterns rather than exact text accents.

In short, idiomelon refers to a hymn with its own unique melody, while avtomelon and prosomoia describe how melodies are reused or adapted to new texts. Together with the octoechos and key chant books, these concepts explain how Byzantine and Slavic chant repertories were built, taught, and performed across centuries.