Ausführung über den Materialbegriff permeates the compositional process by means of quotations from Plato. The material, according to Plato, is available to the philosophers as classes of causes. The composer’s situation is similar, with the various (musical) parameters serving as building material. Like Plato, a composer can procure the material in masses and select from this stock what seems suitable for the construction/work of art. Subsequently, both lay out the materials and assemble them bit by bit. This comparison between philosophy and composition is employed, as, in my opinion, both fields share a close connection, while they are situated between science and art. Moreover, in Ausführung, I make use of extra-musical materials for the first time: the players walk across a prepared floor, while the step length, the placement of the foot, the type of movement as well as the horizontal/vertical alignment of the head and body are depicted in the score. In addition, the live electronics are also completely notated. I wrote the piece right after developing a notation system for electroacoustic music (Dimpker: Extended Notation. Vienna 2013). It is the first work to apply the results of this part of the treatise and thus marks the beginning of my so-called abstract electroacoustic music.