Spectro-morphological Structuring Process in Gilles Gobeil’s “Le Vertige Inconnu”

Section A

Introduction | Spectral Overview | Section A | Section B | Section C | Section D | Section E | Summary | Resources

A reverse attack-decay gesture opens the work, functioning as an anacrusis to the first descending attack-decay gesture. The opening gesture is extended from 2 to 5 seconds by several descending gestures (visible in the spectrograph below) before a second decisive descending attack-decay gesture signals the termination of the first gestural area. While the tessitura of the terminating gesture remains constant, the faster decay of the high frequencies creates a prolongation of the descending gesture, preparing the listener for the first texture-carried subsection.

First Gesture-carried Subsection - 0:00 to 0:15

(anacrusis)

                onset    continuant    termination                 

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The first texture-carried area is delineated by the primary descending attack-decay motive, acting as an onset to the subsection. The main textural area consists primarily of mechanical iterations. A great deal of motion is visible in the spectrograph, but it is motion without direction. The attack-decay gesture terminating the texture-carried area is weaker than those heard previously. Thus the texture continues beyond the gesture until a second descending attack-decay gesture brings the subsection to a more decisive close. The terminating gesture itself exhibits the same construction as the higher structural levels, as illustrated below:

First Texture-carried Area - 0:16 to 0:34

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One of the curiosities of this composition is the collection of disparate sounding sources, particularly the presence of both naturally and mechanically produced sounds. In examining the second textural subsection, however, one discovers the morphological connection between the sounding sources. Textural areas throughout the work are dominated by repeated iterations – short periodic sounds without gestural direction. The second textural subsection consists primarily of insect noises sounding over a rooted pitch-space. However, a need for termination develops as the rooted pitch-space begins to climb in tessitura. It cannot continue indefinitely and therefore tension is created, transforming the texture-carried material into gesture-carried material. The gestural nature is reinforced both by tessitura and with an increase in aggregate spectral energy as the sounding objects increase in amplitude. A third sounding object is introduced between the frequencies previously occupied, complimenting the frequency spectrum to produce maximum effect. At 55 seconds the continuant stops with an interrupting gesture, clearly different than the preceding sounds due to its complimentary pitch-space. However, the terminating function is inconclusive since the gesture lacks the descending morphology of the primary onset/termination motive.

End of Second Texture-carried Area - 0:41 - 0:57

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continuanttermination?

The tension created by the ambiguity of this gesture is increased by the silence that follows. At 58 seconds the interrupting gesture is repeated, followed by a strong descending attack-decay gesture, bringing the subsection to a decided close. Within the first minute of “Le Vertige Inconnu”, Gobeil has established a functional spectro-morphological vocabulary so effectively that it can play upon expectations to create deceptive terminating gestures used to prolong the structural areas.

0:51 - 1:03

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The third texture-carried area contains a similar structural process to the first texture-carried subsection. An increase in spectral density creates motion away from the texture-carried continuant towards termination. A descending attack-decay gesture at 1:32 anticipates the final build towards termination. However, the gesture at 1:37 lacks the terminating spectral energy to bring the section to a close. It is followed by a return of the mechanical iterations, which function as a textural prolongation. The final terminating gesture is a strong descending attack-decay gesture, prepared sufficiently though the prolongation of the terminating gestures to act as a final decisive termination to Section A.

End of Section A - 1:31 - 1:46

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Section A contains four subsections. The opening gesture-carried subsection serves to introduce the primary descending attack-decay motive. The following texture-carried subsection presents three important concepts: periodic iterations as texture-carried material, sectional prolongation by an interrupting motive, and the transformation from texture-carried material to gesture-carried material through the use of increasing spectral energy. The third subsection presents the ambiguity of the relationship between the sounding sources, which is to be addressed later in the composition. The fourth subsection serves to bring the section to a close by repeating the ideas of increasing spectral density and textural prolongation. Section A is summarized below:

Section A - 0:00 to 1:46

Introduction | Spectral Overview | Section A | Section B | Section C | Section D | Section E | Summary | Resources