I think people who know me from online wouldn't be too surprised by any particular song I might like, but people in my "real" life might be surprised by quite a few. I'm not exactly a closet metalhead, though I totally used to be. Gradually, in the past year or two, I have been much more open about this, though I still don't advertise it much. I can discuss metal with my brother, who likes quite a bit of metal, but the rest of my family and many of my friends might be a little surprised at what I listen to. I don't think they would judge me, though fear of judgment is, I will admit, one thing that in the past kept me from talking about my musical preferences.
I don't like death metal. But I do enjoy some melodic death metal, and I really like Wintersun's compositions. I was listening to them at the gym yesterday after not listening to them for a while, and I though of this post, because I think if some of the people in my "real" life knew I liked this song, they might be a tad bit surprised.