Guns N' Roses - Estranged (Piano Demo by Axl Rose)
For whatever reason, I can’t find this on Youtube, but it’s available on Dailymotion. Sadly, I couldn't share this on media, so you'd have to make do with this link.
EDIT: I went on the Guns N' Roses forum and there's a lot of debate as to whether or not this is Axl doing a demo or someone doing a cover. I personally think it's Axl, especially if you listen to the way he plays those keys on the album version of "Estranged".