iPod touch Itouch 1g music sorting question

I want to have music sorted on my itouch in a certain way and im not sure if i can do it this way..me and my wife both share it and the way i have it now is i have it by artist then title and i have a whole list of artists an when i click the artist it goes to all their music..well if i put my wife's music on there i don't want her artists mixed with mine..so is there a way to make it like two folders my wife and mine u click on either my wife's or mine and it goes to either of our artists lists