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Related to canto fermo: Canti fermi
canto fermo(ˈkæntəʊ ˈfɜːməʊ) or
1. (Classical Music) a melody that is the basis to which other parts are added in polyphonic music
2. (Ecclesiastical Terms) the traditional plainchant as prescribed by use and regulation in the Christian Church
[Italian, from Medieval Latin, literally: fixed song]