We spend a good chunk of time in the car, too! My 4 and 3 year olds are currently LOVING the Maestro Classic cds, specifically Peter and the Wolf. It’s a story set to classical music, where each character is an instrument. Sounds boring, but I promise it’s an instant hit. They have other versions, too, like Mike Mulligan and the Steam Shovel, The Tortoise and the Hare, and some other fairy tales. They’re all available on Amazon and sometimes you can get it on YouTube.