Overview of Edgard Varèse’s Density 21.5 for Unaccompanied Flute

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Density 21.5

Edgard Varèse’s Density 21.5 for unaccompanied flute was composed in 1936 (revised in 1944) at the request of George Barrère for the première of his new platinum flute.Inspired by the flute’s capabilities, Varèse sought to showcase the platinum instrument’s full range of sound and explore its timbral capacity. Density is a monophonic work that is characterized by extreme dynamics, angular motives, timbral variety, and complex rhythms. During the span of sixty-one measures, Varèse exploits the flute’s full range of sound and color and almost every pitch on the instrument is realized.
The form of Density is partitioned into three sections: A measures 1 - 23, B measures 18 - 40, A1 measures 41 - end. The first A section can be broken into two parts: Aa mm1-14 and Ab mm.15-23. The B section may be broken into two smaller parts, the first Ba from measures 24-29 and the second Bb from measures 32-36 with the omitted portions (mm. 29-32 and mm. 36-40) functioning as transitional material. The unmistakable return of A occurs in measure 41.
Jonathan Bernard, in “Pitch/Register in the Music of Edgard Varèse,” notes the composer’s fascination with crystals and their influence on his compositional method. Bernard aptly states, Varèse “emphasizes growth through orderly expansion of a bare minimum of an idea that is cell-like in nature.” In Density, Varèse explores the possibilities of a three-note semitone motive through repetition, expansion, and elaboration. During an interview Varèse, the composer explained a “crystallization” analogy and its relationship to his compositions:
Musical form, considered as the result of a process, suggests an analogy with the phenomenon of crystallisation. The clearest answer I can give...

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-- “Varèse: A Sketch of the Man and His Music.” The Musical Quarterly, 52.2 (1996): 151-170.

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