Amazing song and album, but how can anyone not think "A ghost is born" is nothing short of genius. To me, the best opening track from a Wilco album has no competition, its "At least that's what you said".
The demo versions are both worth checking out, may even be better than the final! There's one uptempo country-ish one and another more classic-riff-rock version, and they are in a completely different key, I believe. Seek out the YHF demos!