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JOUrNAL of MUSIC ThEOrY
shows the tonal systems changing with each sonority, beginning in the four-
sharp system and ending in the one-flat system. This, too, could be seen as an
instance of suspended diatonicism, since the tonal systems change so rapidly
and come to rest on a system so far removed from the one in which the pas-
sage started. But the crucial difference between Lasso’s passage and rossi’s is
that in the Prologue, the music could come to rest on any of the sonorities in
mm. 5–7, and the governing diatonic system at that point would be clear. In
rossi’s passage, on the other hand, if the music were to stop on any of the
sonorities from m. 74 to m. 81—even if the sonority were a major or minor
triad—there would not be a clear enough context to determine the governing
tonal system or the status (diatonic or chromatic) of the chord in question.
There are features that make certain tones stand out as more stable, if
not diatonic. Most of the chromatic ascents and descents fill in the interval
from G to D or from D to A, both of which are significant intervals within the
natural or one-flat systems. Note, in Example 21, the soprano’s ascent in m. 72,
the bass’s ascent from m. 73 to m. 75, and the soprano’s ascent beginning in
m. 77. Furthermore, all of the quarter notes and most of the repeated eighth
notes in the passage belong to the one-flat system, and many stand out as the
goals of chromatic ascents or descents (especially the soprano AΩ in m. 74 and
DΩ in m. 75). Certain progressions may also be interpreted as cadential: The
motion from E major to F major (mm. 73–74) can be interpreted as an evaded
cadence to A minor. In m. 75, the soprano and bass move quite forcefully from
an augmented sixth, E≤–C≥,
35
to an octave D, although an actual cadence to
D minor is evaded by the middle voice’s motion to B≤. Finally, the motion from
m. 79 to m. 80 could be seen as a plagal-type cadence to D major, anticipating
the final cadence.
Nevertheless, overall the passage remains an example of suspended dia-
tonicism. Of all the potential cadences, very few fall on strong beats, and most
are evaded, which weakens their ability to define a tonal system. There are
many situations where the use of several chromatic tones in succession in
multiple voices creates ambiguous sonorities and progressions. One of the
most common ways rossi creates these situations is by having two voices move
by consecutive semitone in parallel motion, therefore maintaining the same
interval size.
36
The complex of tones created by this type of motion can never
belong to a single tonal system, at least not by the third consecutive interval.
Nearly all of the music from the middle of m. 73 to m. 80 contains this type
of motion between at least two of the voices. On the second half of the third
beat of m. 73, the soprano and bass rise in parallel major thirds from D–F≥ to
35 This augmented sixth actually has two conflicting effects:
On the one hand, it intensifies motion to the octave D,
which could highlight the status of D as a diatonic tone, and
on the other hand, it destabilizes any sense of diatonicism
by virtue of the fact that E≤ and C≥ cannot belong to the
same tonal system.
36 Strozzi also used this technique in Example 19, but the
governing tonal systems were clear for the reasons outlined
above.