Why does my Guitar Hero Metallica PS3 keep saying Warning - You most connect a microphone to continue?

The warning message you're seeing indicates that the game requires a microphone to proceed, likely because it includes vocal gameplay elements. Check to ensure the microphone is properly connected to the PS3 and recognized by the system. If you’re using a compatible microphone and still receiving the message, try restarting the game or the console. Additionally, verify that the microphone settings in the PS3 system menu are correctly configured.