Osborne, Mary Pope <br/><br/>
Moonlight on the Magic Flute:  Magic Tree House #41. 

 - new York, NY :  Random House/ A Stepping Stone Book,  2009. 
 - Magic Tree House .
<br/><br/> Jack and Annie travel to Vienna, Austria, in 1762, where they meet the young Wolfgang Amadeus Mozart and his sister and help save the budding genius's life. 
<br/><br/><label>ISBN: </label>9780375856471