How to transfer music from pc to iphone by itunes (ios ver. 6.1.3)?

How to transfer music from pc to iphone by itunes (ios ver. 6.1.3)?

Click the "sync" button.

You could add the files to iTunes library, and connect phone and sync with iTunes.

If you sync your iPhone with iTunes, you may lose something on your iPhone. It's risky. I'm using 4Videosoft iPhone Transfer Platinum, which is able to transfer music, photos, movies, etc. From PC to iPhone. You can transfer the files to iPhone without losing anything on iPhone. It's pretty safe. You can have a try.