Osborne, Mary Pope. <br/><br/>
Moonlight on the magic flute 

 - New York :   Random House,   2009 
 - 106 p. :   ill. 
 - Magic tree house ;   13 .
<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' life. 
<br/><br/><label>ISBN: </label>9780375856471 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Adventures stories<br/>Tree houses--Juvenile fiction<br/>Magic --Juvenile fiction<br/>Time travel --Juvenile fiction<br/>Brothers and sisters--Juvenile fiction