Why aren't my songs from iTunes syncing to my iPhone?

I have 1365 songs in my iTunes library which I can play. But only 1260 songs are transferring over to my iPhone. I just got a replacement iPhone about 4 days ago so I'm not sure if that has to do with anything?

I had the same problem. I'm 80% sure that the iTunes can't sync all the songs because they are in other folders than the iTunes syncing folder. If you move them in there, I'm positive that they'll sync

How do you move them to the "synching folder?"

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