Hi Boat Guy,
Welcome to Apple Support Communities. To isolate this and see if the issue only occurs in your user account, try setting up a test user account and play your music there. Use the steps from Set up users, guests, and groups on Mac to set up another admin user and test there.
"Add a user
- On your Mac, choose Apple menu > System Preferences, then click Users & Groups.
If the lock at the bottom left is locked, click it to unlock the preference pane.
2. Click the Add button + below the list of users.
3. Click the New Account pop-up menu, then choose a type of user.
- Administrator: An administrator can add and manage other users, install apps, and change settings. The new user you create when you first set up your Mac is an administrator. Your Mac can have multiple administrators. You can create new ones, and convert standard users to administrators. Don’t set up automatic login for an administrator. If you do, someone could simply restart your Mac and gain access with administrator privileges. To keep your Mac secure, don’t share administrator names and passwords.
4. Enter a full name for the new user. An account name is generated automatically. To use a different account name, enter it now—you can’t change it later.
5. Enter a password for the user, then enter it again to verify. Enter a password hint to help the user remember their password.
6. Click Create User."
If the same thing does not happen in that account, there may be a user-specific app or setting in your account causing issues. The first place to check would be your login items. You can find and remove those from the Apple menu > System Preferences > Users & Groups > [your user account] > Login items. Check out Open items automatically when you log in on Mac for more details.
Take care.
