Just when I think I've manually sorted out all my music the way I want it in iTunes, when I go to sync with my iOS devices, they come up all jumbled. What I mean is this: I have about twelve or so singles from one artist. In iTunes, those twelve singles show up as twelve separate albums. However, on my iPhone they're all grouped into one big "Unkown album" for some reason. This doesn't just happen with singles either. I've got a few artists who's two or three albums have all been mushed together into one album with 70+ songs in it (These albums aren't unknown, they're given one of the artist's actual album names). Also, I have a bunch of songs with the artist as "blah blah blah feat. blah blah blah." I set the album artist for all those songs to the main artist so that they all fall under the proper albums and artists in iTunes, however they come up as separate artists in the Music app on my iPhone. I'm getting these same problems on my iPad. I have no idea why this is happening. I've grouped my songs the same way by album artist and whatnot for years and it's never separated them by the individual song's artist. All I've changed recently is that I've given all my songs a rating and create some smart playlists. Please help, I'm missing dozens albums and have dozens more artists than I need.