What does 'App Not Responding' mean in the context of a music app and how can I fix it?

'App Not Responding' means the app has frozen and isn't responding to user input. This can be due to a variety of factors like high CPU usage, insufficient memory, or a software bug. Try force-closing the app and reopening it. If that doesn’t work, restart your device. Clearing the app’s cache might also help. If the problem persists, the app itself might be the issue and requires an update or reinstall. Ensure your device meets the app's minimum system requirements.