Esther M. Zimmer Lederberg
Cantus

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Girolamo Mei
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The music you are listening to is "Il Combattimento Di Tandredi E Clorinda - Ma Ecco Homai" by Claudio Monteverdi's "Seconda prattica". This music was considered to be the beginning of modern opera, as now poetry could be set to music with a new, Humanist theory of rhetoric tacens, and not the old, inflexible, strictly hierarchical Scholastic view of reality.

Cantus (sometimes spelled cantos) comes from the Latin for "singing"; derived from cantera. Used with respect to polyphonic music, cantus has several meanings:

Cantus firmus ("fixed song", sometimes canto fermi) is a pre-existing melody forming the basis of a polyphonic composition. The term was not used until the 14th century, but cantus firmus was considered the norm in polyphonic composition from roughly the 10th through the early 15th centuries; almost all of the music of the St. Martial and Notre Dame schools employ cantus firmus, as well as most 13th century motets. (Many of these motets were written in several languages, with the cantus firmus in the lowest voice.) Gregorian chants and plainchant employed cantus firmus.

Cantus durus (hard), cantus naturalis and cantus mollus (soft) were overlapping hexachords that in mediaeval music formed the basis of musica recta, also called musica vera (the correct or true music). All three hexachords encompassed the three most common semitone steps: from B natural to C, from E to F, and from A to B.

Cantus durus was the hexachord that included B natural, which was regarded as "hard"; cantus mollus was the hexachord that included B flat, which was regarded as "soft"; cantus naturalis included neither B nor B.

All three hexachords bore the pattern TTSTT; the semitone was always the third note of the scale. The place where the scale moved from full tone to semitone was called the "mi-fa" step.

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It was permitted to change from one of these hexachords to another; the point of change was termed a mutation (similar to the modern "modulation").

In the 14th century the hexachord system was expanded, permitting the use of semitones in positions other than mi-fa. This entailed transposing hexachords to 'alien pitches' or 'unaccustomed places. Music so created was called musica ficta (false or contrived), because the hexachord was specially created for the sake of the semitone.

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