Nope rubbish, there are numerous reasons why some music may be obscure. For example, the music created may not fit into a template that allows for classifcation, ie Savage Republic didnt quite fit into post-punk nor did they quite fit in with alternative/college rock, so they went largely unoticed. Like it or not, an artists music stanRAB a much better chance of being noticed if it can be identified within a genre/movement/scene. Furhermore, an artist may release material themselves or on a tiny label that only allows for ultra-limited release and little if any promotion.