It's not Charlie Parker, it's Jon Hassel

The song actually comes from the movie the Boy with Green Hair. It was very relevant to to the plot because it was made during the Soviet Scare in Hollywood when they were black balling writers and actors who they thought were aligned with the communists just because some of them were different, in other words Jewish or liberal. Some people like John Garfield was career was destroyed and he died a young man. Some people left the country or had ghost writers write scrips because they could not get jobs. A lot of people were caught up in the frenzy and was unjustly blackballed.
The movie was about a little boy who was orphan who lived with his Gramps who loved him. But woke up with Green hair one morning and the movie tells how the towns people and former friends ostracized him because he was different even though he did nothing to look the way he did. He became a outcast and the song tells the boy that the greatest thing is to be love and be loved in return. Because even though he was basically blackballed he did have people who loved him and that was the most important thing.

Nat King Cole sings it best. Movie was very good because of Jim Caviezel.

Nature Boy
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."
http://www.frugalsites.net/911/attack/

And on Moulin Rouge lol

The song is Nature Boy, Charlie Parker's version
It's also on the Talented Mr. Ripley soundtrack, I like that version better.

I think the second track he plays in the bar is Starless and Bible Black by the Stan Tracey Quintet from Under Milkwood.

Thank you!!!

Nature Boy
http://en.wikipedia.org/wiki/Nature_Boy_(song)