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Cantus firmus - Wikipedia
Cantus firmus | Medieval, Polyphonic & Chant | Britannica
Cantus Firmus - Music - Oxford Bibliographies
Cantus Firmus - BEYOND MUSIC THEORY
What is a cantus firmus in music? - Classical Music
Composing a cantus firmus – Open Music Theory
What Is a Cantus Firmus? (and How to Write One) – Flypaper
Cantus Firmus | Music 101 - Lumen Learning
1.9: Cantus Firmus - Humanities LibreTexts
Cantus firmus - New World Encyclopedia