Why won't some songs transfer from my iPhone to iTunes on my computer?

I've purchased many songs from iTunes on my phone and when I hook my phone up to my computer, most of them sync and are added to my library but some do not, which means when I go to the iTunes Store, it says I haven't purchased those songs when I actually have. Is there anyway to get them to sync onto the computer or should I try emailing Apple?

Some fixes that might help…
*Make sure you have your the same Apple Account on both your iPhone and your Computer
*Extract the Music files from your iDevice using iFunBox (a free program) http://dl.i-funbox.com/
*Get a better internet connection on your computer
*Download the music from your iPhone on your computer
*Reinstall/Get the newest version of iTunes

Hope I Helped.

If your songs are all purchased from iTunes store, Plug in iPhone to computer, then go to iTunes menu "File-> Transfer purchases", It will copy your bought songs from iPhone to computer.
Or You may refer to this guide, it will show you the detail steps to transfer files from iPod/iPhone to computer or iTunes, including music, video, playlist, photo, etc. It's easy to understand and works pretty well for my iPhone. Hope it helps. Email me if you need further help.

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