I posted the lyrics to this some time ago as a puzzler and no one could figure it out. Mel Lyman was the composer, and I'd rather retain my early memories of him than any later ones. I'll post the lyrics here again:

SIMPLE BOY
(Words and Music by Mel Lyman © 1963)

A simple boy lived in our town,
And he was knows for miles around.

Chorus:

He'd sing, "Birds fly, aren't they pretty,
Sun, moon, all is beauty,
Fish swim, they don't make a sound."

He did not know his given name,
The people went, the people came. (CHO)

The people said, "Alas, poor thing,
He sits and knows not what he sings." . (CHO)

The years went by, the boy's now gone,
But those who care still sing his song.*

Final Chorus:

They sing, "Birds fly, aren't they pretty,
Sun, moon, all is beauty,
Fish swim, they don't make a sound."

* New verse by Charlie Ipcar