The interpreter who approaches the music of John Cage composed after the middle of the 20th century is often disconcerted by a great freedom of execution, associated with a set of precise instructions. In previous work [8] we modeled these time brackets (TB) by parallelograms to build computer interfaces for interpretation assistance in the context of Cage's Two 5. Over time ([9], [10], [11], [13]), we realized that the shape used to represent TB, brought important information for the interpretation and musical analysis. In this paper we apply previous research to a computer display conception of John Cage's Music for___ (1984-87).