Interesting. I'm really deep into music, collect and buy lots of niche stuff from all kinds of genres, I listen to my collection quite a lot and enjoy it, but I find it increasingly difficult to discover actual good music that I wasn't aware of before. Sure, we all know the usual recommendation engines and some more specific year-end lists help too, but generally the recommendations feel all too narrow - "You like The Antlers?" - "Let me suggest this band that fits into the very same sub-genre and probably has been named all over the place before."
That's just not good enough. Whenever your taste isn't bound to certain genres, yet still very specific and hard to put into a score, it gets difficult. Actually I think this is a problem better solved by a small round of enthusiasts, real humans instead of algorithms or crowdsourced data. The latter always seem to fail when your taste ranges from, let's say James Holden (electronic, weird, yet carefully crafted), to Miles Davis, each for very different reasons.
While I buy my music, I enjoy the community over at what.cd which is just as enthusiastic about music as I am. Another community that helps can be found on rdio, which I use for previewing and discovering music - I only follow people with taste I can absolutely agree on there, and I'm really not a social network guy, but the community on rdio is great and knowing what those guys are listening to is very rewarding, and sometimes a good tastemaker.
Yet, I can't say that I'm completely satisfied with those options - there have to be some better places out there.