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JOUrNAL of MUSIC ThEOrY
one another. One can only say that the passage begins in the one-flat system
and ends in the three-flat system. The lowest staff in the reduction tracks these
changes in tonal system with dotted barlines followed by the new flats. The dot-
ted barlines indicate that the essential chromatic tones in stage 1 of the reduc-
tion bring about changes of tonal system without any direct chromaticism.
Most examples of essential chromaticism are created by descending-fifth
motion in the bass, as in m. 5 of the previous example. Although it is much
less common, essential chromatic tones can also be created by ascending-fifth
motion. Vicentino used this technique in several of his works. In the excerpt
from Anima mea presented as Example 7, he uses the technique quite beauti-
fully to balance a previous descent by fifth.
As the reduction shows, the passage begins in the one-flat system, which
changes to the three-flat system through a series of descending-fifth motions,
only to cancel the newly added accidentals in the subsequent measures.
Although the chord progression in mm. 97–98 mirrors the progression from
mm. 94–95, the systems do not change accordingly because the sonorities in
mm. 97–98 still belong to the three-flat system, which has not yet been contra-
dicted. Only with the reappearance of AΩ do the tonal systems begin to change
again. Also, because the passage contains only essential chromatic alterations,
both stages 1 and 2 of the reduction have been omitted, leaving only the single
staff to track the changes of tonal system.
Chromatic tones in the opening sonority. In Example 6, the opening sonority
of a piece contained a chromatic tone. There are many such cases, including
ones where it is quite difficult to distinguish chromatic from diatonic tones.
Example 8 is a reduction of the first four measures of Pomponio Nenna’s
motet Ecco, ò dolce, ò gradita. Even without the B≤ signature, the BΩ of the open-
ing sonority would soon be revealed as a chromatic tone rather than a diatonic
tone. The soprano leap in m. 2 ensures for the listener that B≤ is at least an
essential chromatic tone,
24
if not a diatonic tone, and the persistence of B≤
throughout the measure defines the BΩ at the end of the bar as a chromatic
alteration. Despite the one-flat signature in the music, I consider mm. 1–3 to
be in the two-flat system, since the E≤ in the bass and alto arise as essential chro-
matic tones, against the background of which the alto EΩ in m. 3 becomes a type
A alteration. (The one-flat system that governs most of the piece is not firmly
established until the cadence at the end of m. 4.) Analyzed this way, the striking
E≤ sonority under “dolce” becomes a sweetly relaxing move into the govern-
ing tonal system, rather than a striking chromatic event against the opening
G-major sonority, a reading that I find more consistent with the text.
25
24 At this point in music history, with the innovations of
the secunda prattica, the distinction between essential and
nonessential pitches starts to blur. Nenna does use a verti-
cal diminished fifth between the soprano and alto in m. 4.
However, this diminished fifth is between two upper voices,
both of which are consonant with the bass, and is not nearly
as harsh as a leap of a diminished fifth in the soprano of
m. 2 would be.
25 It is true that “dolce” was often used ironically by com-
posers of this period and therefore was often set using
harsh-sounding sonorities. However, I do not believe that
Nenna intended such a setting here.