The issue is indeed with the Stanton C500 CD Player. I have had two of those and both are now door stoppers now. They are junk. Spend a little more for a denon dual CD player.
Thanks Nick. That's all I've ever used are the CD-R audio CDs. In fact, when I download on iTunes, it gives me several options including "audio, mp3, or data CD or DVD." I thought an mp3 was an audio file. Yes, no?!?
You might want to try using blank music CDs instead of data CDs.