Eugene KURTZ (1923-2006). Autograph music manuscript signed, Improvisations for solo double bass, 1968; 12 sheets 37 x 27.5 cm. In a typed note, Kurtz indicates that "the performer must give the impression that the work is being created at the very moment he tunes the instrument"; he then gives detailed indications of the double bassist's behaviour throughout the piece, and details special effects. The work is dedicated to the double bass player Pierre Hellouin. The manuscript is carefully written down in black pencil on 12-line tracing paper (+4 ff. printed explanations).