Add Music while agent is waiting for someone to pickup

Hello, i have setup goautodial and evrtyhing is working like a charm, however while the predictive dialer is calling agent is in silent, i want to put music there untill some client picksup.
I mean where it says "YOU ARE CURRENTLY THE ONLY AGENT IN THIS CONFERECE" after this message i want to play music so my agent doesnt get bored untill one of the clients pick up.
how can i do this
Best Regards