In traditional orchestration theory, sustained tones (long notes) are often regarded as subsidiary materials for harmonic support and background accompaniment. This paper, adopting the "Orchestral Spatial Orchestration" as its theoretical framework, re-examines the structural functions and aesthetic values of sustained tones in orchestral orchestration from five dimensions: dynamic variation and musical imagery expression, global layout conception, musical breathing function, the contrast between sustained and non-sustained tones, and staggered voice entries with long-short combinations. The study reveals that sustained tones are not merely materials for maintaining harmonic stability, but core means for shaping musical imagery, constructing spatial conception, and achieving dynamic balance of sound. From the perspective of global layout, orchestral sustained tones exhibit diverse aesthetic characteristics—ranging from ethereal transparency to moderate density, from vast profundity to subtle tremor; in musical breathing, sustained tones serve crucial functions as "breath pivots" and "tension regulators"; while the contrast between presence and absence of sustained tones constitutes a key driving force for building sonic tension and propelling musical development. Particularly significant is that the function of sustained tones can also be manifested through staggered voice entries in "long-short combinations"—different voices entering successively with temporal offsets, forming vertical interweaving and horizontal alternation of long and short notes, transforming static sustained textures into dynamic multi-dimensional sonic structures.
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