I apologize if this has been discussed before, but it is something I have wondered for quite some time. As an iphone 3g owner, it is harder and harder to fit everything I want onto my phone's 16gig space. Is there a way to save space by having only one version of a song, but having it show up under multiple albums? For example, one song that is on the studio album, a greatest hits album, and a soundtrack requires 3 of the exact same files, but if there were a way to keep only one file, and not have it mess up the continuity of the albums, it would save me a lotttt of space. I had trouble putting this into words but I hope you understand what I'm asking. Thanks!