Springsteen, 67, said the song was called "I'll Stand By You" and had some personal significance, said The Hollywood Reporter.
"It was pretty good. It was a song that I wrote for my eldest son. It was a big ballad that was very uncharacteristic of something I'd sing myself, but it was something that I thought would have fit lovely.
"At some point, I'd like to get it into a children's movie of some sort because it was a pretty lovely song," he said.