Life of Charlemagne
Einhard's biography of Charlemagne, cited for the emperor's diligent correction of the discipline of reading and chanting.
Preface and Praise of Sacred Scripture
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Chapter IV: The Judgments and Examples of the Fathers
— Einhard cited: Charlemagne most diligently corrected the discipline of reading and chanting
"Charlemagne himself, as Einhard says in his Life, most diligently corrected the discipline of reading and chanting"