单词	cantus firmus
释义	cantus firmus /ˌkantəs ˈfəːməs / noun (plural cantus firmi /ˌkantuːs ˈfəːmʌɪ/) Music A melody used as the basis for a polyphonic composition: this four-part mass uses as its cantus firmus a popular French tune... In the early years of the seventeenth century, English composers increasingly turned to the hexachord as a cantus firmus for keyboard pieces. Orgelbuchlein Pieces - Bach's ‘Little Organ Book’ consists of 45 short chorales mainly having the cantus firmus in the soprano voice with the lower voices acting as counterpoint to the chorale melodies. The cantus firmus is sounded in semibreves in the middle of the three voices. Origin Mid 19th century: from Latin, literally 'firm song'.
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