1. It contains one of the few remaining examples of Celtic Plainchant . 2. Clausulae eventually became used as substitutes for passages of original plainchant . 3. A low plainchant performed by a 24-voice male chorus. 4. Anglican chant grew out of the plainchant tradition during the English Reformation. 5. The movements differ in their treatment of the source plainchant . 6. For several centuries, different plainchant styles existed concurrently. 7. The chant manuscript records mainly Western plainchant of the Roman-Frankish octoechos. 8. Neumatic notation remains standard in modern editions of plainchant . 9. The existence of quilisma in the musical notation indicates the influence of plainchant . 10. Fontes Cantus Bohemiae is a database cataloging plainchant sources in the Czech countries. 
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