Structural/Architectural : individual sonorities, fragments, phrases derive their meaning from the overarching structure into which they are integrated. This applies to classical music and death metal.
Sonorous/Aesthetic : Focus is on the actual quality of the sounds, which tend to form organic, free flowing structures around themselves. Western musicians suck at this, as is demonstrated by French impressionist music. Indian music is a better example of this approach.
Few styles of music fall completely into one category, the sonorous qualities of classical are quite deliberate, as are the structures of Indian improvisations. The point is that these styles place their emphasis differently.
What happens when one approach is ignored entirely, you get Serial music on one hand, in which the qualities of sounds are completely arbitrary, I'm not sure what I'd say completely overlooks the first approach, any ideas?