Why do my most recent iTunes music purchases not sync to my iPhone? For some reason, the last 15 songs or so that I've downloaded won't sync to my iPhone. I've tried:


Removing all music by unchecking "Sync Music" (didn't actually remove the music for some reason) and then re-adding it.
Putting those 15 songs in a playlist and syncing only those 15 songs.
Rebooting the iPhone.
Rebooting the computer.


Nothing has worked so far. Has anyone experienced this and found a solution?


Note:

The computer is a Fall 2013 Macbook Pro 13-Inch running OS X 10.9.1 with the latest version of iTunes installed. The iPhone is an iPhone 5S running iOS 7.0.4.
I had this exact same problem and found the answer I was looking for within one of the Apple communities. Simply go into iTunes store and scroll right to the very bottom. There amongst the small print you'll see an option for purchased. Click on there and you will see a list of all songs/albums and you can choose to either download all or individual tracks. Once downloaded they appear in your library as normal. Don't ask me why they don't appear straight away, but this resolves the problem of those not transferring when syncing