Jolivet: 'A work for a solo instrument is (always) an "ascèse" (exercise). For the composer, who must penetrate the inner nature of the instrument, must destil its most characteristic expressive possibilities and master its technique in order to demonstrate all of its qualities. For the performer, who by means of his (or hers) playing and his musicality magnifies the virtues of his instrument, and only makes an impression with this and by this'.