In fact, there's a composer who does that, Matt Uelmen, listen to this composition,  
	 
	Diablo 2 - Wilderness 
	 
 
	there are several sections within the same composition, something like A, B, C, D, E, F, G, etc. Note that none of these sections has a melody / harmony similar to the previous section, each section presents a new harmonic and melodic material.    
	 
	I don’t know the name of this style of structure or composition, but i would like to know!