I like the song and at first I could have sworn it was Tom Petty. I was most surprised to find out that it was by another band. Is it a folk song? I would lean more to the No tendency on this occasion. I think Steve Gardham's comments are interesting. They give evidence that it is in the process of becoming one. It just seems a little early to assert that the process has gone far enough for it to be seen as a folk song.