another iTunes problem
 

im not having a good experience with this version..ugh. anyways heres the latest situation...
i never had any playlists before a few days ago, but it just seems easier when im in my car to select a playlist so i added a few. ill just use one of them as an example.. the top 500 rock and roll songs of all time. i added it to my ipod as a playlist threw itunes, but now when i select an artist (not playlist) from my ipod, it only has the songs that are in the playlists, the other songs that i already had disapeared. i dont think they were deleted because 13 gigs are still being used up. its kinda hard to explain. before i added that playlists i had 80 something songs by led zeppelin, now i only have 5, the ones that are on the playlists. i would just upload the songs again becuase they are still on my computer, but i dont want to if they are there and taking up space. so should i just upload the songs again?