If you were searching about contrapuntalism and landed on this site, this is the article for you.
Contrapuntalism is another word for musical counterpoint. It describes the relationship between two lines of music which are distinct from one another but happen to harmonically intertwined or related while being melodically independent.
The term more often seen is contrapunctus, which is commonly associated with the composer Bach and his “The Art of Fugue” which is made up of 18 contrapuncti. For example Contrapunctus I is a simple fugue whose simple music device is reinterpreted for each of the contrapuncti.