A dangerous TOD for the likes of moi.
Just a summary list of, um, lists:
Books and a few magazines
Records, CDs
Laserdiscs, DVDs, Blu-rays
Musical scores of various types
Concert & theater programs, roadshow movie programs
Commodore computer and related books & ephemera
Some mid-century US regional & travel books & various kitschy ephemera
Probably one or two things I'm forgetting
Much of the above are "accumulations" as opposed to formal "collections", but each has its own sub-categories that are indeed collections in the "Must Have The Entire Set" sense. I'm also not a Hoarder in today's generally accepted sense, but I know that the more I can rid myself of, the more meaningful and manageable the "collections" will become. It's a difficult process, no question, (so, in that sense I'm hoarding), but I was able to do some of this in a big way several years ago, and there's more to come.