Gerard Kockelmans, influenced and inspired by twelve-tone music, was a master of counterpoint, which is defined as the relationship between two or more musical lines (or voices) which are harmonically interdependent yet independent in rhythm and melodic contour.
Although he was clearly influenced and inspired by the twelve-tone music, which was very popular in his day, he never completely embraced this style. He was a master of counterpoint. In music, counterpoint is the relationship between two or more musical lines (or voices) which are harmonically interdependent yet independent in rhythm and melodic contour. 
