J.S.
Ditto to what Michele R said on the CD selection. My son has three CD's in his room: Classical Lullabye's - Einstein collection, Miracle by Celine Dion, and an Enya CD...I don't remember the name of the CD, but the second song is called Wild Child. He likes to hold my face while I sing it, and he'll sing it with me. (He'll be three in 9 days!) I also made up my own lullabye that I have been singing to him since he was months old that puts him to sleep almost instantly. Isn't that insane!?!?! It's really simple, and the music is another lullabye that I can't remember, but MY words are: 'go to sleep, go to sleep, go to sleep my (insert term of endearment here and childs name) it's okay to go to sleep, mommy is right here, say good night and go to sleep you will have lots of dreams, say good night and go to sleep you will have lots of dreams.' I sing it over and over and he's out in minutes. Unless he's fighting his sleep then he'll sing with me and it comes out sounding a little punk rock-ish. LoL!!
In the car he'll listen to the Cars soundtrack (and sing along) or this other Disney movie buddy soundtrack and he'll sing along to that too. Unless Daddy is listening to The Ticket in which DS will sing, "stick it up your tailpipe". Grrrrrrrrrrr!!!! I'm not a fan of The Ticket, especially with our son in the car. When I'm driving I keep it on one of the Christian music stations, which are really good. Right now most of them are playing Christmas music, another favorite for me is Amy Grant's Home For Christmas CD which I could listen to year round! I've had it for YEARS and it's just beautiful. I even had it in labor and delivery - the nurses loved it. Of course I had a December baby, so it was fitting. :-)
You can buy the CD's almost anywhere: Target, Wally world, Best Buy, also check out Half Price Books...or Amazon.com. You never know.