What to do with old music

Reorganizing my music collection has stirred up a question in my mind: what do I do with the things I don’t listen to any more?

I have all sorts of music I don’t like and would only listen to for nostalgic purposes. (And, to be honest, some of it is music I’d never be caught dead listening to, but I can still enjoy the memories it stirs.)

Do I copy it to my computer for archival purposes? Do I sell back the CD to get other music I’d rather have but may not listen to 5 or 10 years down the road? Do I just hold on to it for memory’s sake?

Maybe I’m more emotionally attached to my music than some people are, but I don’t think that’s such a bad thing for someone like me.