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:''This is a page regarding a '''Canon''' in liturgics. For other uses of the term Canon, see [[Canon (disambiguation)]].''
A '''canon''' is a structured [[hymn]] used in a number of Orthodox services. It consists of
[[Biblical Odes|nine ''odes'' ]], sometimes called ''canticles'' or ''songs'' depending on the translation, based on compositions (also called odes) found in the [[Bible]] and, with one exception, the [[Old Testament]].
The canon dates from the 7th century and was either devised or introduced into the Greek language by [[Andrew of Crete|St. Andrew of Crete]], whose penitential Great Canon is still used on certain occasions during [[Great Lent]]. It was further developed in the 8th century by Sts. [[John of Damascus]] and [[Cosmas the Hymnographer]], and in the 9th century by Sts. [[Joseph the Hymnographer]] and [[Theophanes the Confessor|Theophanes the Branded]].
The nine odes may be found in any complete Orthodox Psalter, and they are:
# The Ode of [[Moses]] in Exodus ([[Exodus]] 15:1-19)
# The Ode of Moses in Deuteronomy ([[Deuteronomy]] 32:1-43)