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

I have already transferred over 350 songs. And i still have space left so it's not that. But certain songs won't transfer over and it's really annoying. Do you guys know why?

Hi, you can transfer songs to your iPhone without iTunes. I can recommend you AnyMP4 iPhone Transfer software, which allows you to transfer music from PC to iPhone with high quality. Try to use it if you need.

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