Alrededor de una musica ausente is an 18-minutes long composition, written for three Instrumental Groups (Group I: two trombones; Group II: four flutes; Group III: strings [6 0 3 2 1]) and three computer-based Digital Signal Processing Stations, positioned in the performance space so as to form a circle around the audience. / Instrumental Groups and DSP Stations establish a relationship of outputs to inputs with respect to each other. Throughout the composition, sound material is gradually transformed as it flows from one Instrumental Group or Digital Signal Processing Station to another. Transformation of the sound material is accomplished by means of digital signal processing and, in the instrumental parts, by way of compositional techniques modeled after specific electroacoustic sound processing techniques. / The organization of musical structures and formal processes was informed by certain characteristics associated with devices that handle information represented digitally, by techniques of electroacoustic sound production and transformation, and by particular extended instrumental techniques. / Volume 1 of this dissertation is a written text articulated in two parts. The first part gives a historical and aesthetical context for my composition. The second part is an analysis of materials and formal processes used in the piece. Volume 2 is the music score of the composition. A CD containing the patches and soundfiles utilized in the electronic part supplements both volumes.* / *This dissertation is a compound document (contains both a paper copy and a CD as part of the dissertation). The CD requires the following system requirements: Windows MediaPlayer or RealPlayer.

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