Lyric discussion by StarkRavenMad 

Cover art for Baby lyrics by Rufus Wainwright

I'm thinking this song may contain references to his crystal meth addiction. He temporarily lost his eyesight while he was addicted, so perhaps the lines " And since then I can't see straight And since then my smile's been fake Funny I know the troubles I've seen But through one eye only that's clean" refer to that. His "baby" could be a lover of his, or it's possible he's referring to the drug itself. Either way, this is a beautiful song.