Yes you can, you just need to have an individual library for each person. The best way to do that is use Libra (
http://homepage.mac.com/sroy/libra/) it allows you to create and switch between multiple libraries. When you create a new library make sure you go to your music folder and add the music that you want (all you have to do is drag the iTunes folder, or the specific artists that you want into the library window in iTunes.) Hope that helps.