Right now, this is my biggest issue with iOS 10, since I've been using iTunes to store my music ever since star ratings appeared in 2002—and I've been rating and syncing songs ever since the ability was added on the iPod Classic. It's how I've organized my music for over a decade, so having to switch to heart and crossed-out heart icons sucks. With macOS Catalina, your iTunes media library is now available in the Apple Music app, Apple TV app, Apple Books app, and Apple Podcasts app. And Finder is where you can manage and sync content on your iPhone, iPad, and iPod touch.
If you have iTunes installed on your computer, choose your device to update to the latest version of iTunes.
If you have a Mac
If you update your Mac to macOS Catalina, your iTunes media library can be accessed in the Apple Music app, Apple TV app, Apple Books app, and Apple Podcasts app. To manually back up, restore, or sync your iPhone, iPad, or iPod touch, use Finder.
If you can’t update to the latest version of macOS
You can update to the latest version of iTunes (up to iTunes 12.8).
Open the App Store on your Mac.
Click Updates at the top of the App Store window.
If any iTunes updates are available, click Install.
If you have a PC
If you don't have iTunes installed on your computer, get it from the Microsoft Store (Windows 10) or download the latest version from Apple's website.
Depending on the version of iTunes that you have, there are a few ways to update.