What are you people talking about swine is such a powerful song I don't see why she shouldn't its a really creative piece with sounds that ties in rock with electronic music. it's literally the next advancement of music, merging different -yet musically similar- genres, which most vocal artists don't try to do.
This is AMAZING, not being a pessimist! But I have a feeling that Swine will never be a single. I love the song, but we have to admit that every song on ARTPOP could be a single, so it's tough!