Dave, Fist of Odin
Well Marivohn, I don't know about Mr. X, but I do know a little something about the Rainbow connection. It's a way to explain why there are so many songs about, and what's on the other side of, rainbows. It's still rather poorly understood, but science feels sure that one day they'll find it; and it's a connection between the lovers, the dreamers, and you.
In addition, all of us are under it's spell; I know that it's probably magic; and even though I've heard it too many times to ignore it, I know that it's something that I'm supposed to be.
I know that's an incomplete explanation, but it's my understanding that's a summary of the research involved on the R.C. hypothesis to this date. I hope that helps.