No song has changed history.

For a song to have "changed history," human beings would have to react to brief intellectual stimuli like your knee to the doctor's rubber hammer. They hear something a few times and bam! they swing into action!

Dream on.

Of course, if all "changed history" really means is "drifted in and out of consciousness while countless other related, but far more powerful and influential, things are actively being done, mostly by other people," then I suppose no one could argue.