Music That Won't Drive Me Crazy!

Hi everyone. I come again to you ladies, and this time to keep me sane. We will be driving to California this year for Thanksgiving, which means about a 14 hour drive. Usually, as I drive my son to and from daycare, I sing to him. My "playlist" is limited as I don't know many songs, or can't think of the rest of the words. This list barely lasts the 15 minutes to daycare, so I know that it won't last 14 hours.
I am looking for suggestions of where to find sing-a-long songs like the ones I grew up with. We had a mom that would come in with a guitar and had a book of songs like Home on the Range, She'll Be Coming Around the Mountain, etc. I can sometimes get a verse, but don't remember most.
Also, if anyone has any suggestions of kid-friendly CD's, that would be great too. I had bought "The Little People" CDs, and I only get through about 15-30 seconds of a song, and have to turn it it off after about 5 because it is so obnoxious.
He really likes to dance to certain songs on the radio if he is in the right mood, but they are so random, I haven't figured out if it is a specific song, or just his mood.
If it matters, he is still rear facing, and I do get carsick, so some of the more interactive ones, we may have to do at home - but I would still love the ideas.

Thanks for any and all advice!

UPDATE: I appreciate the suggestions for the DVD player and have even been offered one for the trip, but our son has never watched TV. We don't plan on starting it anytime soon, and definitely not introducing it in the car. I know that this will probably be helpful in the future though, thanks!