I've downloaded some spoken word books of stories for the kids into my itunes and I thought I had burned them onto a CD successfully. Only my stereo and car stereo won't play them. Dh think this is because we have used CD-RW discs and we should be using a different kind. Is this right? What kind of discs do I need? I'm a bit desparate as I have 5 hours in the car with 3 children coming up and was hoping to gain some peace with story cds!