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The '''''Octoechos''''' (also known as from Greek '''οκτοηχος'Paraklitiki'') is can refer either to the eight-tone (or mode) system of Church music or to the liturgical book containing the weekly variable texts in each of the eight tones. It contains St. [[John of Damascus]] is credited with the systemization of the musical forms of the Church. In Greek usage, the ''Octoechos'' book is only the Resurrectional material for [[Sunday]] services which varies in the eight-week cycle, and thus is also called the '''''Anastasimatarion'''''. The Greek book for all seven days of the weekly material is the '''''Parakletiki'''''. In Slavic usage, the ''Octoechos'' (or ''Oktoich'') book includes the variable material for every day of the divine services related week, and thus is equivalent to the tone Greek ''Parakletiki''. The final form of the week''Parakletiki'' was significantly influenced by the 9th century St. [[Joseph the Hymnographer]].