Hungrybear9562's original cries of glee to Schoyoho's autotune to the countless variations (seriously, I've heard the acoustic, metal, rap, and spoken-word versions of this thing - all awesome in their own way).
Of course, we know that it was just a couple of decades ago that Kermit the frog sang about the Rainbow Connection (note, Willie Nelson also does a great version).
Then there's Judy Garland singing about that place Somewhere Over The Rainbow (note: Jeff Beck does an awesome version of this one!)
"I had before me the arch of an even rainbow; a perfect rainbow - high, wide, vivid. I looked long; my eye drank in the scene, and I suppose my brain must have absorbed it... the mighty rainbow."
I think there's only one way to describe all of this - it's so - what's the word I'm looking for - oh, yea, Intense!