The Itsy Bitsy Spider.
The Itsy Bitsy Spider was the only song that would keep Dylan sane on long (or average length or very, very short) car rides when he was a baby. Once we discovered his love for this stirring anthem, invoking it kept us from pounding our heads on the dashboard or otherwise turning the music to unholy levels.
None of my kids could deal with the car either. They’re all grown up now and appreciate the car now, but the screams still ring in my ears.