This is an excerpt from the film "Deliverance." I copied and pasted it here as I was unaware of the story behind it. Amazing.
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Duo guitar and banjo was not part of the original movie script until a cameraman filmed this scene.
The guy who played guitar in the movie Deliverance is Ronnie Cox.
NOTE: the family of the boy was well paid.
When the filming of the movie group stopped at a gas station somewhere, one of the players began to play a few notes on his guitar.
There was an Autistic boy watching the filming at the gas station and heard the music.
He began to react timidly, on his banjo, playing what he heard.
Then began an incredible dialogue of instruments between the guitarist and the autistic child and his banjo , it was the only way by which he was able to communicate.

This remarkable scene has been included in the film!
Look at the expression of the autistic child. At the beginning he seems uncertain; but when the music is growing in intensity, he loses his lost air and
shows an expression of pleasure and happiness.
After this magic moment, the boy loses his expression of Ecstasy and closes himself in his little world.

Look at the expression of the autistic boy, in particular, to the end.
This scene is a memorable part of the film.


http://youtu.be/NFutge4xn3w