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Redouble modulations in Bach

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The second manner of applying this style is the
reverse.
The first eighth is played as a sixteenth, the
second as though it were dotted (Ex. 104).
Explaining the third procedurefor the performance
of eighth notes, Sancta Maria states:
La tercera manera se haze, corriendo tres Corcheas,
y deteniendose en la quarta, y despues corriendo
otras tres, y deteniendose en la quarta, y
aduiertase, que este detenimiento ha de ser todo
el tiempo que fuere necessario, para que la quinta
Corchea venga a herir a su tiempo en el medio
compas, y desta manera todas. De suerte que van
de quarto en quarto, lo qual se haze como si las
tres Corcheas fuessen Semicorcheas, y la quarta
Corchea tuuiesse puntillo. Esta tercera manera
es la mas galana de todas, la qual sirue para glosas
cortas y largas. (Part I:46r)
The third manner is done moving three eighths
quickly, and holding back on the fourth, moving
another three quickly, and holding back on the
fourth. Notice that this holding back must be
enough to allow the fifth eighth to strike in
the medio compas, all being performed in this
manner. Thus they go four by four, as though
three were sixteenths, and the fourth dotted.
This third manner is the most gallant of all; it
serves for short and long glosses.
Sancta Maria further explains that holding back
too much causes "desgracia y fealdad" (unpleasantness and
ugliness) in the music.
Therefore, the first three eighths
should be played moderately (Ex. IO5 ).
The first example below (a) shows a group of
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137
eighths as they rhythmically appear In example 105 ; the
dots below the notes Indicate the compas and medio compas.
The other examples (b, c) offer possible interpretations
of Sancta Maria's above explanations.
(b)
probably performed
(=)m j m i
Ornamentation
Redobles and Quiebros
Sancta Maria presents two basic types of ornamental
figures:
the redoble (literally "redouble") and quiebro
(from "quebrar," to break).
Examples of basic types are
shown in examples 106 to 108.
Redobles are appropriate for ornamenting whole
notes, i.e., filling in the time value of a full compas.
If played longer they become ugly and offensive.
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Quiebros
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