2. Pertaining to the chant of the Kyrie, when nine invocations are notated fully, the musical «form» requires that they be sung in their entirety. In contrast, when one melody is to be repeated for the first invocations of Kyrie, this invocation is only sung twice. Similarly for the following invocations Christe and Kyrie (for example, Kyrie V). When the final Kyrie is written with a distinct melody (e.g., Kyrie I), the Kyrie preceding it is only sung once. In this way the general rule of repeating each invocation once is preserved.
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