'Viderunt omnes'
Greta-Mary Hair
Example 7. Matching Psalm-tone incipits with differentiae.

Example 7 requires one to connect each Psalm-tone incipit with its correct differentia. These are the modal fragments which are normally given in MSS as abbreviations for the Introit and/or Communion Psalm-verse and Gloria Patri respectively, and which enable one to identify the mode of these chants. Memorisation is, therefore, imperative.
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