Pierre Boulez (1925-2016) composed Dialogue de l'ombre double for clarinet and live electronics in 1985. This same year, Alain Damiens of Ensemble InterContemporain premiered and recorded the work with the help of Andrew Gerzso of Institut de Recherche et de Coordination Acoustique/Musique (IRCAM). The piece alternates between pre-recorded and live sections that are performed with varied levels of amplification and reverberation creating a dialogue between the parts. Boulez also includes detailed instructions for the spatialization of the pre-recorded tracks that play through six equidistant speakers that surround the audience. Furthering the complexity of this work, it is available in two published versions: version aux chiffres arabes (Arabic numeral version) and version aux chiffres romains (Roman numeral version). Each version includes much of the same musical material, but arranged in a different order. Performance of Dialogue de l'ombre double requires extraordinary technical facility and musical understanding from the clarinetist, the dedicated involvement of a highly qualified sound technician, and the use of a spacious, technologically equipped performance venue. This performance guide aims to facilitate greater accessibility and understanding of this challenging work, in order to encourage widespread performance of this extraordinary piece.