Tiny bubbles

What is the alcohol content of the head on a beer? Think about it. You pour the brewskie and there's all these bubbles consisting of what exactly? To the casual observer, "Oh yeah that's carbon dioxide!!!" Are we so sure about that? What do we know about alcohol, that it evaporates quickly. I'm thinking, that maybe, those bubbles contain some stray buzz buddies that are going to waste. I could be all wet on this. Please advise. So there I am, glomming the fuzz as a noble experiment. I'll let you know my findings.