I know what you mean Dwight. I've had hundreds of albums, tapes and CD's over the years and been to many concerts as well, which a few I only remember being there.
All the media I had, as well as some equipment, grew legs over several occasions and only have a couple recent purchase/gift CD/DVD's now.
I'm having a problem with my tools growing legs now
Anyway, I think it was 1981 when I saw 38 Special in GR. Great show. This is one of my favorites: