Do you mean you are talking to the dead, like zombies from the grave as it were, or just people that are no longer alive like Buddy Holly for instance?

If it's the latter, like I said before, it doesn't mean anything other than the person appearing in your dream represents whatever you think of them, or thought of them when they were alive.

Usually when dreams keep recurring it’s because they are trying to tell you something and you aren’t getting the message, perhaps you dream about the dead people because you think highly of them and feel they would be able to offer you advice or assistance in a way that the people you actually know and are alive would not? There are no straightforward answers to dreams, everyone is different; there is no 2 + 3 = 5 or, I dream about dead people = answer to everything – dream solved: you must work out what these dead people mean to you, write down their names on a piece of paper and write a list of words and feelings you think belong to them from your point of view. Write down in a dream journal day by day all your dreams until you see a pattern forming in the kinds of people that are visiting you in your dreams, the kinds of things they are doing, what they are saying and the underlying mood of the dreams. When you have a nice amount of info on your dreams, start looking at what is going on in your life at the moment, what has gone on in your life in your past, as you grew up, and compare that information with the information you’ve gathered about your dreams and make the connections yourself; other people can only guide you in possible directions to interpreting your dreams but only you know specifically what different people, symbols and feelings mean to you, so only you can fully make sense of your dreams.

Coming to a site like this and writing your dreams down can be a big help; it makes an online record of your dreams that is dated, which you can cross-reference in the future with what was going on in your life at the time – your dreams may not make sense to you right now, but if you were to read them again in a few months or a year from now you may be surprised at how much sense they make when you consider your feelings in hindsight.