Through Gustav, the mole, the reader is introduced to different sorts of instruments and musical activity.

Feeling that something is missing in his simple life, Mole acquires a violin and learns to make beautiful, joyful music.

After Kate's companion, Lee, moves out of their house, Kate, a San Francisco detective, agrees to take care of a precocious 12-year-old girl. The girl disappear

The final book in the award-winning, best-selling trilogy shows that while fame and fortune might be temporary, the best songs stay in your heart forever.