What is the name of the song Catch plays in the jazz bar?

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.