Dereglement passager de corps heterogenes is a work for flute (doubling piccolo and alto flute), clarinet (doubling bass clarinet), horn, piano, violin, cello and contrabass which explores the concept of "virus" within a musical form similar to the theme and variations. During its elaboration, I imagined what could metaphorically be the effects of different virus on what I define as "musical organisms". This idea suggested a number of variations that could serve as laboratories to experiment different levels of interaction between the virus and the musical organisms. This thesis consists of the musical score and a detailed analysis.

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