Why won't my library on my computer sync with my iphone?

I have music in my library on my computer but I can't get it to be on my iphone music. I've tried syncing them several times but it still doesn't work. Can anyone help?

Have you tried simply setting the iPhone to be manually managed for music and video? When you do that, you can just drag and drop the files to the iPhone. Your question says nothing about this.

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