1, try to restart the phone or try to upgrade the system.
2. Check whether the mobile phone is connected to the network normally, or try to switch networks.
3. Try sending the song again.
4. Go to Settings-More Settings-Applications-All-Find WeChat, try to clear the data, or uninstall WeChat and try downloading and installing again.
5. Go to Settings-More Settings-Restore Factory Settings-Restore all settings and try it.