Something about air molecules being scattered in all directions?
Dunno… but…
Mister blue sky please tell us why
You had to hide away for so long (so long)
Where did we go wrong?
Hey there mister blue
We’re so pleased to be with you
Look around see what you do
Everybody smiles at you
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The sky looks blue because the shorter blue light waves are scattered more than other colours in the spectrum, making blue more visible to the human eye.
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Whatever the scientific reason, it’s a perfect color to admire anytime from morn till dark.
I do hope no one changes it! 
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by early evening my sky goes a bit hazy
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But is it science or the your glass of ale? 
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heavenly spirits righty
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Ah, nice way to end the day then!! 
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