Hello! I understand that you are trying to play music from the Berliner Philharmoniker Digital Concert Hall, but the wheel just keeps spinning and nothing plays. I'd love to help you get this sorted out.

To start, may I ask a few quick questions to better understand your situation?
- Are you using the Digital Concert Hall app or a browser on your Mac running OS X 10.15.7?
- Does this happen with all music or only certain recordings?
- Have you tried playing music on a different network or device to see if the issue persists?
- Have you recently updated the app or your system?

In the meantime, here are a few basic steps that often resolve streaming loading issues on a Mac:

1. Check Your Internet Connection: Make sure your Mac is connected to the internet and the connection is stable. Try loading a different website to confirm.

2. Restart the App or Browser: Quit the Digital Concert Hall app (or browser) completely and reopen it. Sometimes this resets the connection to the streaming server.

3. Clear Cache: If you are using a browser, clear the browser’s cache and cookies, as old data can cause loading issues.

4. Update Software: Ensure your Digital Concert Hall app (if using) and your OS X are up to date.

If these don’t help, we could troubleshoot more advanced settings or check if there is any server-side issue. Please let me know the answers to my initial questions, and we can proceed from there!