"Nature Boy" is a song by Eden Ahbez, published in 1947. The song tells a fantasy of a "strange enchanted boy... who wandered very far" only to learn that "the greatest thing... was just to love and be loved in return". Nat Cole's 1948 recording of the song was a major hit, and "Nature Boy" has since become a pop and jazz standard, with dozens of major artists interpreting the song.
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http://en.wikipedia.org/wiki/Nature_Boy
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There was a boy...
A very strange enchanted boy.
They say he wandered very far, very far
Over land and sea,
A little shy and sad of eye
But very wise was he.

And then one day,
A magic day, he passed my way.
And while we spoke of many things,
Fools and kings,
This he said to me,
"The greatest thing you'll ever learn
Is just to love and be loved in return."

"The greatest thing you'll ever learn
Is just to love and be loved in return."