Music speaks where words fail. That's the premise for this new reality series that helps ordinary people risk it all to surprise someone they love with an unexpected musical performance that says what they are really feeling: "I love you," or "marry me," or "thank you." With just five days to pull it off they are teamed with a celebrity vocal coach, a choreographer, and two music producers who are the professional help they need to stage a live "flash musical" that helps…