| http://www.w3.org/ns/prov#value | - r in these Offertories and Communions there are the most varied kinds of ascent, descent, repeat..., delight for the ''cognoscenti'', difficulty for the beginners, and an admirable organization... that widely differs from other chants; they are not so much made according to the rules of music... but rather evince the authority and validity... of music.<ref>Apel, p. 312.</ref>
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