Apple Music crashes when syncing library

Hey RichardRogersavatar,

We'd be happy to help out. Sounds like you're having issues with Music app crashing while uploading music to iCloud. With this being an app that's built into the operating system, it'd be best to start by making sure your Mac is fully updated to the latest macOS version available for it. For help doing so, check out these steps:

Use Software Update

Before following these steps, it's a good idea to back up your Mac.

1. From the Apple menu  in the corner of your screen, choose System Settings or System Preferences.

* If you chose System Settings, click General on the left side of the window. Then click Software Update on the right.

* If you chose System Preferences, click Software Update in the window.

2. Software Update then checks for new software. 

* If Software Update finds new software, click the button to install it. The button might be named Update Now, Upgrade Now, Install Now, or Restart Now, for example. You might then be asked to enter your administrator password.

* If Software Update says that your Mac is up to date, then no new software is currently available for your Mac model. Software Update shows only software that is compatible with your Mac.

This is outlined further here: Update macOS on Mac - Apple Support

If you already are fully updated or the issue persists after updating, try testing things out in safe mode. For help with doing so, check out the following resources: How to use safe mode on your Mac - Apple Support

Keep us posted on the results and we'll go from there.

Take care!