Do you have an Apple Music Membership?
You can try these steps to see if it will restore it:
Turn iCloud Music Library off, then on again
On your iPhone, iPad, or iPod touch:
- Go to Settings > Music, then tap iCloud Music Library to turn it off.
- Close Settings.
- Go to Settings > Music, then tap iCloud Music Library to turn it on.
- Turn on “Show Apple Music
If they still don’t load:
- in settings- iTunes App Store - your name - sign out- then sign back in - you will need to turn iCloud music library back on again.
If this is for purchased music from iTunes:
ypu can try Redownloading onto your iPhone
On an iPhone, iPad, or iPod touch
- Open the iTunes Store app.
- On your iPhone or iPod touch, tap More in the menu at the bottom of the screen, then tap Purchased. On an iPad, just tap Purchased.
- Depending on what you want to redownload, tap Music, Movies, or TV Shows. If you use Family Sharing, tap My Purchases or choose a family member’s name to see content that they purchased.
- Find the movie, TV show, or music that you want to redownload, then tap it.
- Tap to the right of the title. The movie, TV show, or music downloads to your device. You can find movies and TV shows that you redownload in the TV app§ or Videos app, and music in the Music app. Don't see the item that you purchased?
Changing countries messes things up. Make sure You have restored your payment method to match your current country you went back to.
Please post back if any of this helps or if you tried something else that helped, so we may help others.