Iphone 4 won't play some songs after update?

I updated my iPhone to the latest software (ios 6) and now some of my songs won't play at all they will just skip to the next song that works. I have tried plugging my phone back into itunes and re-syncing it but that hasn't worked is there anything else I can do?

Try pluging it into i-tunes and then removing the songs, and putting them back on from your library.

Just delete the songs and re copy it

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