Hi Winny263,
We appreciate you reaching out to us. We understand that you are experiencing issues playing songs on the Music app and it shows a "not playing" message.
We’d like to gather additional details that may help us be in a better position to assist you.
Are you experiencing the issue when using a Wi-Fi network, cellular data, or both?
Are you using a VPN on your device, on your router, or access point?
Is the device set to the correct Time Zone? Also, is the Date & Time set automatically?
Is your Apple ID set to the correct country or region?
Do you have a different Apple device that is using the same Apple ID? If yes, are you experiencing a similar issue on your other device?
In the meantime, we recommend that you check if you can play songs on our Apple Music page.
Apple Music
Performing this step may help us determine if the issue is caused by your iPhone 4s.
Take care!