PeakDash

On a BBC Radio interview, Jeff Lynne talked about how he came up with this after he locked himself away in a Swiss chalet attempting to write ELO's follow-up to A New World Record. "It was dark and misty for two weeks, and I didn't come up with a thing. Suddenly the sun shone and it was, 'Wow, look at those beautiful Alps.' I wrote Mr. Blue Sky and 13 other songs in the next two weeks."

I think Mr. Blue Sky is a song about having bad times for so long that you just expect them. When "Mr. Blue Sky" appears, you can tell the good times are here.
"Mr. Blue Sky, please tell us why, you had to hide away For so long" is more of a question why the good times didn't get here that quickly.
Another lyric, "But soon comes Mr. Night, Creepin' over, now his Hand is on your shoulder, Never mind I'll remember you thus way." Is a reminder that the bad times will come back but you have to remember this one moment of happiness.

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