TIME BRACKETS – flexible time brackets surround each event in most of Cage’s NUMBER pieces, giving a range of possible beginning times, ending times, and (therefore) durations. In One^lO, time brackets surround single pitches taken from the GAMUT of all possible natural harmonics on the violin’s open strings.  In Two⁶ empty time brackets are used by the players to situate entire blocks of material, including SILENCE for both players, MICROTONAL passages for the violin (which ASCEND over the course of the piece), IMITATIONS of Erik Satie's Vexations for the piano, and gamuts of pitches derived from the DUCHAMP TRAIN (ascending in the case of the piano, but expressed statically as a sustained double stop in the violin).  Which material appears in which time bracket is determined by the CHOICE of the PERFORMER.