Abstract
As an extension to the MIDIM‐language formulated by Kaegi, the author has developed a system named CANON for the description of musical patterns. In this article subclasses of the MIDIM‐concept PREDICATOR are defined. Such a class is described by a CANON‐vector which determines domains for the parameters pitch, duration and intensity instead of the fixed values occurring in a MIDIM‐descriptor. These CANON‐vectors may be concatenated to a comprehensor with which a great number of one‐voiced musical patterns can be described. A system for the description of polyphonic patterns is in development. These systems may be used to research the occurrence of patterns in various musical styles, and at the same time could be useful for composers when forming their ideas.