I don't know that I believe in ghosts, really. I don't not believe, either.

We live in a house that's over 60 years old. There are times when I hear music or voices when there's nobody else in the house. It's entirely possible they're from outside, but I've never seen anyone around the house when I hear the voices. *shrugs* As long as it's not a malicious spirit, they're welcome to stay.