My personal fave is 5000 Fingers Of Dr. T produced by
Dr. Seuss. It starred Tommy Rettig from the old "Lassie"
tv show. Pete Lind hayes and Mary Healey play the adult
role models and Hans Conreid plays Dr. T who is recruiting
children to play his huge piano that trails off into the
horizon.

My other favorite (which may be out of print) is called
"Hand In Hand" which is about actual kids growing up
together-- one is Irish Catholic, the other Jewish.

• Hand In Hand