Communication Breakdown

Julia has been enjoying her evening concerts with her father so much that periodically throughout the day, she will request a song.  She gets her point across using two methods.  Pointing at the guitar and either strumming her chest or bopping around dancing.  While I perfectly understand what she wants, I can't seem to make her understand that I can't provide this type of entertainment and she will have to wait for papà to come home.  More than once this exchange resulted in her breaking down into tears.