Why can't I delete or add songs onto my iPhone through iTunes 11.0.4?

I can delete songs directly off of my iPhone but even if they're deleted, iTunes still says they're on my iPhone. I also can't delete any songs off of OR add any songs onto my iPhone through iTunes. What is happening.

Added (1). I have fully updated both my iPhone and iTunes.

Be more specific its probably the old itunes, update both your phone and itunes

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