Tra la la la! Can an opera house mouse and a disrespectful diva make beautiful music together? Maybe . . . if she learns some manners! Fernando loves Mozart, Puccini, and Strauss, and lending a paw at the old opera house. Unfortunately, diva Delores wants no help from a mouse. She craves glamour and spotlights and praise--and she's getting her chance to take center stage. But it's all going wrong; she's missing her entrance and flubbing her song. Fernando can save her--but only if Delores behaves. Will Delores hit a sour note? Or will she team up with Fernando . . . and bring down the house?