I have had every iPhone since the 3G version and just now with the 4S I'm encountering some problems for music such as: 1. Smart playlists not syncing from iPhone to iTunes. My smart playlists are based on ratings (such as all 5 stars). If I rate a song 5 stars on my iPhone, it'll show up on my iPhone playlist, but not on iTunes. 2. If I rate a song on iTunes, it would appear on my iTunes smart playlist but not on my iPhone. 3. Artist not showing up on iPhone, but the album shows up on the album list. All naming conventions are correct and it's not a compilation. 4. Changing the artist name on iTunes does not show up in iPhone with the newly changed name. Would love to know if anyone can help with these issues. I've set my iPhone to manual sync, have done that with all my previous iPhones with no problems.