YouTuber SebastianL2012 explains:
We discovered by accident that the Star Wars Theme Song has magical abilities to calm the baby down. He was screaming and crying in the car one day, and the MP3 player started playing this song and he just stopped. Then, every time after that when he'd be crying for no reason (we knew his diaper was clean, tummy was full, etc.) and we'd play this song, he'd perk right up.
Very funny, but do me a favour: don't put your cell phone so close to your baby's head.