Its composer termed the "Bourreaux de Solitude" sections "Commentaries" to avoid the thematic connotations of the term "variations." Its score contains the phrase "Oubli Signal lapide" referring to an earlier work by the same composer whose structural elements were copied in this work. To contrast with "sound-blocs" of its "L'Artisanat furieux" sections, its composer employed a serial technique with pitch and duration and it was the first of his works in which he introduced the idea of indeterminacy. Incorporating an alto flute, vibes, guitar, percussion, viola and a xylorimba, as well as an alto singer, it takes its name from a collection of poems by Rene Char. For 
Its composer termed the "Bourreaux de Solitude" sections "Commentaries" to avoid the thematic connotations of the term "variations." Its score contains the phrase "Oubli Signal lapide" referring to an earlier work by the same composer whose structural elements were copied in this work. To contrast with "sound-blocs" of its "L'Artisanat furieux" sections, its composer employed a serial technique with pitch and duration and it was the first of his works in which he introduced the idea of indeterminacy. Incorporating an alto flute, vibes, guitar, percussion, viola and a xylorimba, as well as an alto singer, it takes its name from a collection of poems by Rene Char. For 10 points, identify this major work of Pierre Boulez which depicts a workman's tool that is, presumably, accountable to none.
Its composer termed the "Bourreaux de Solitude" sections "Commentaries" to avoid the thematic connotations of the term "variations.
Le Marteau sans Maitre [or The Hammer without a Master; or The Unmastered Hammer]