There are a lot of CDs that have "gone missing" from my collection and I think it has something to do with my adult children (One in particular) periodically helping themselves and then not owning up to it. I don't really complain because at least I can take comfort that they spend some of their time listening to Classical Music. When they actually ask to borrow, I make a point of burning the disc to a Hard Drive (now that I have started trying to burn my collection anyway).