To resolve issues with eSound not playing music or allowing you to add songs to playlists, follow these steps:

1. Check Your Internet Connection: Ensure your device is connected to the internet. A weak or unstable connection can lead to playback issues.

2. Restart the App: Close the eSound app completely and then relaunch it. This can fix minor glitches in the application.

3. Update eSound: Make sure you are running the latest version of the eSound app. Visit the official eSound website and download any updates if they are available - learn more.

4. Clear App Cache (on Android):
- Go to your device's Settings.
- Select Apps and find eSound.
- Tap on Storage and then select Clear Cache. This can resolve many playback issues.

5. Reinstall the App: If the problem persists, consider uninstalling eSound and then reinstalling it from the official website or your app store - learn more.

6. Check for General Issues: Sometimes, eSound may face larger issues (e.g., server problems) that might temporarily affect its functionality. You can check the eSound changelog for any known issues that might be affecting playback - learn more.

7. Contact Support: If none of the above steps work, reaching out to eSound's support can provide you with specific assistance. You can contact them through their support contact listed on their website - learn more.

8. Explore Community and Forums: Other users may have experienced similar issues. Check platforms like Reddit to see if there are additional troubleshooting steps recommended by the community - learn more.

By following these steps, you should be able to troubleshoot and resolve the issues you're facing with eSound.