Do you listen to strange music? I generally listen to Jewish and Classical music. Amongst Classical i like Romantic (particularly Tchaikovsky). Usually when searching for music Romanticism and Tchaikovsky are easy finds.
Jewish music, however, is quite different. It is a very small segment of the market, as it targets and very small segment of people. And yet within it i specifically like children's choirs from the 70s and 80s. (Right now i'm listening to London School Of Jewish Song, Mah Nuvu (1969)). Music applications will not have such a listing, and stores will not carry it. This is understandable. I don't expect it, would be quite suprised otherwise.
But, that got me thinking. Are there other such niche markets? What do you listen to? Just curious.