I currently keep all my songs on my computer in my itunes library and sync them with my iPod. My brother and I share the computer and he is now getting an iPod and wants to put his own music on it. Is it possible to have TWO different libraries in iTunes each with different music? So that when my brother plugs his iPod in it will transfer only his songs and when I plug mine in it will only transfer MY songs? Is this possible? Thanks.