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Textbook of Gregorian Chant (1930) - MusicaSacra

Textbook of Gregorian Chant (1930) - MusicaSacra

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34 Part Two.<br />

the original scales were four in number, after the division there<br />

were henceforth eight <strong>Gregorian</strong> tones, divided into four authentic<br />

or primitive tones and four plagal or derived ones. The first are<br />

designated by the odd figures 13 5 7, the second by the even 2<br />

468.<br />

!<br />

I4><br />

(0<br />

Upper<br />

Range<br />

Lower<br />

Range<br />

Ancient<br />

Terminology<br />

Authentic<br />

Protus<br />

Plagal<br />

Protus<br />

Upper . Authentic<br />

Range j Deuterus<br />

Lower<br />

Range<br />

Plagal<br />

Deuterus<br />

Upper i Authentic<br />

Range ! Tritus<br />

Lower<br />

Range<br />

Plagal<br />

Tritus<br />

Modern<br />

Terminology<br />

First Mode<br />

Second Mode fcz<br />

Third Mode<br />

Fourth Mode<br />

Fifth<br />

Mode<br />

Sixth Mode<br />

m<br />

a<br />

G<br />

•<br />

i<br />

- •<br />

Q ""<br />

m a -<br />

. *A<br />

1<br />

"•XT"<br />

Q<br />

r<br />

1<br />

L<br />

t<br />

•<br />

|<br />

i<br />

_J<br />

Q * I<br />

a r<br />

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