The aforementioned dumb things.
This tool lets you tweak spotify's recommendation engine to find very specific kinds of tracks. Its totally unstlyed and I've got no documentation written for it at the moment, but feel free to ask me any questions you might have about it. It needs you to log in to your spotify account so that it can push the recommendations in to a playlist for you. Note that this wipes the playlist each time. As such I recommend creating a playlist just for transferring recommendations.