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The instant I saw the thread title, I thought of Bohemian Rhapsody, just like OP. I don't think there really can be a greatest song, but the fact that at least three people in the same thread on a web forum all thought of the same song amongst millions speaks to the power of that song. If not literally the greatest song (as that would be difficult to measure), it is at the very least the most iconic one, for me.