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Noun
1. cantus firmus; plainsong; plainchantMusic
Wikipedia definition
2. Cantus firmusIn music, a cantus firmus ("fixed song") is a pre-existing melody forming the basis of a polyphonic composition. The plural of this Latin term is cantus firmi, though the corrupt form canti firmi (resulting from the treatment of cantus as a second- rather than a fourth-declension noun) is also attested. The Italian is often used instead: canto fermo (and the plural in Italian is canti fermi).
Read “Cantus firmus” on English Wikipedia
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Read “Cantus firmus” on DBpedia

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