When I updated to ios 9 on my iphone my songs on my itunes playlist got deleted. Why?

When I updated to ios 9 on my iphone 5s over half of the songs on my one of my favorite/largest itunes playlists. Why?

Probably they're not deleted. Here's something you can try: Songs marked as "part of a compilation" will NOT show in your iPhone/iPod/iPad although they ARE there, and can be accessed via a search or listing by genre. So, uncheck the "compilation" tag and see if you can see them now. It worked for me. That's because they're stored in a different folder and won't come up under the Artist/Album etc list. Weird.

  • Why do songs get deleted from my iphone when i sync it to my itunes library? Everytime i sync my iphone (5) to my itunes library, all the songs i had just recently bought on my iphone get deleted and if i try to re-purchase it on itunes it just says "purchased." Somtimes i will even try to re-purchase it from my laptop and even though the purchased song it in my library, it doesn't transfer to my iphone.
  • Why are some songs not showing up in my playlist on my iPhone 4s? I'm trying to organize my music so I made playlists. I put all the songs I want in the playlist on iTunes, then I go to sync my phone and about half the songs are missing? I tried everything just doesn't make any sense Also I tried to put the songs in the playlist on my phone itself then I sync it with iTunes and just takes the song right back off? This is frustrating anyone have an answer to this problem lemme know please
  • Updated iPhone iOS 6.0 and it deleted All MY CONTACTS I do not have anything stored on icloud. Now, I do have all my stuff stored to my computer on iTunes, i just tried to restore my iPhone, but my contacts are not there. I'm very frustrated and mad that this happened.
  • My itunes says it hasn't updated een though I updated it? I went to update my iphone and it said I had to update my itunes first and restart my computer (i have a macbook.) So I did all that and went to try and update my phone again and it still said I had to update my itunes first so I did it again and it is still not allowing me to update my iphone. It still says I need the latest version of itunes. What am I do wrong!