There are only three CDs I have ever played so much that I have worn them out. Like, they won't play anymore without skipping simply because I have played them just that much.
Point of Grace - Life, Love and Other Mysteries (don't judge, this is an AWESOME CD!)
Caught Up - self-titled
Although there are some I can't believe aren't worn out yet - Maroon 5, Britt Nicole, Three Days Grace, and Erin McKeown all have CDs that I listen to very consistently and I'm surprised they're still intact.
Have you ever listened to a CD so much it quit working??