Q: I have a probleme with my iPhone 6s , all the music is delete

Hi Katia,

I understand that you don't see your music on your iPhone. Let's see if we can figure out what is going on. 

The first thing that comes to mind is if you are using Apple Music, make sure that iCloud Music Library is turned on. This would make your music library that is on your computer, show up on your iPhone to be streamed or saved offline. Take a look at the article below to check that setting. 

Check your Apple Music library settings
https://support.apple.com/en-us/HT204926

Let me know if this takes care of it. If not, let me know and I could suggest something else. 

Have a good day