On the song/search API I can pass a mood -- happy, sad, haunting. Are all songs tagged? That is: if I search with mood=haunting (or I really want haunting songs and search with mood=^haunting), will some songs be excluded even though they are haunting because they just haven't been tagged as haunting? Obviously you'll never be able to tag the whole entire database, but is most of it tagged? Most of it not?
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