Howdy Bozacito,
Thanks for using the Apple Support Communities! I understand that your Music app on your iMac Pro is crashing and freezing frequently. Let’s take a look and see what we can do. I'm happy to help!
Let's first make sure your iMac Pro is fully up-to-date on software. If there is an update available, let's make sure your Mac has a backup before performing the update.
How to back up your Mac
How to update the software on your Mac
If you are still experiencing troubles, let's try to use safe mode and a different user account to test if the crashing/freezing is happening in those users.
Use safe mode to isolate issues with your Mac
How to test an issue in another user account on your Mac
Lastly, I would suggest using Activity Monitor to monitor your CPU and Memory when the issue is prevalent.
How to use Activity Monitor on your Mac
Please respond back if you continue to have troubles.
Best regards!