Why can't I add my music from my library onto my IPhone?

I downloaded music from Youtube to put onto my IPhone, I dragged and dropped the music here and there and now it is in my Itunes library, but I can't put it on my phone. Syncing doesn't work at all. Why the **** can't I do this? Is this some copyright bull ****?

No, but if you look up on google there's an option that let you enable the drag and drop. Sorry I can't help you more, I moved to android ages ago.

By the song name there's an arrow click on that and click add to iPhone. Make sure your iPhone is plugged into the computer/laptop.

Likely it could be a copyright issue. I mean, You did you a use a youTube converter to violate copyright laws and steal music for your iphone

Instead of syncing set iTunes to manually manage your music. Then drag and drop the songs from whatever folded you've got the songs downloaded from YouTube in, and drop them on the iphone. Did you try that? Your question doesn't say anything about that. Manual management works in every iPod device I've used including an iOS 7 iPhone 5. Copyright has nothing to do with this and if it did it would've kept you from downloading from YouTube in the first place.

If you've recently updated your iTunes software remember to reboot your computer.