Old "CD" players need to be fed CDA files. That is the "audio" from a burner program, not "Joliet" data disks. If you get a player that reads MP3 and other formats you get a whole lot more on a disk, about 10x.
I use MP3, any media players will see them. My wife's Lincoln even has a USB port to plug a thumb drive into, and so does the new JVC in dash player I put in the truck (Crutchfield.com $129). I still have the PC in my Honda.
