Updating itunes library
Thing is, it seem that, right now, I have to do this every time I add a new song to a playlist or it won't add it on my phone.
All of your music will be deleted from your phone (but NOT from i Tunes on your computer).
5) You should now have something up that says "Sync Music" at the top.
This has seemed to work for most people I've talked to about this so far.
OK, here's the deal: With the latest update to both i OS on my i Phone and to i Tunes, I can no longer sync new songs I add to my playlists to my i Phone.
New versions of i Tunes are almost always better than the last—but not every time and not for every user.
All of your music will now begin re-syncing (being added again to) your phone.