More of the truth, found only in fragments

Gert describes a large part of my, and I suspect many other people's, CD collection, though I don't own the actual album she's referring to:

I quite like this album, but I suspect that if it wasn't in my collection, I wouldn't miss it.

It seems to me that all record collections can be divided into three: the stuff you never want to get rid of and continually listen to, the stuff Gert describes above, and the stuff that's so hideously embarrassing you don't want to take the risk of throwin it out, giving it away or taking it to a second hand shop just in case someone sees you with it.