Too many CDs

I rescued 4 more crates of CDs from my parents house yesterday. It's good to have all my music in one place but I have too much of it. I think I have about 4000 CDs.

It was great to listen to my Cramps CDs yesterday but I have serious storage problems now. I need more shelves. I'm also a bit frightened by the multiple copies that I have of several albums. I have 3 copies of one Goldfrapp CD which is not good.