The Mozart Girl, by Barbara Nickel

Nannerl Mozart is talented and creative, but when your little brother is the toast of Europe, you will find yourself in the shadows!  And not so much for the talent that he obviously possessed, but for being the boy.  For no matter how skilled and hard-working Nannerl is, she'll never be allowed to become a professional musician.  Her efforts will always be treated as a fancy and considered a gimmick.  Nonetheless, she is determined that none of that will stop her from her dreams.  And this Christmas, when she and her brother are performing in Versailles for the King and Queen of France, Nannerl intends to unveil nothing less than a full symphony that she's written!

A modest and enjoyable middle grade historical novel about a little known piece of musical and women's history.  Some of the adventures may strike the reader as implausible, but Nickel does a remarkable job of avoiding anachronistic thoughts and feelings, while still making Nannerl instantly relatable (especially for anyone who's experienced sibling jealousy).  The result is a heroine who is charming and inspirational, as she seizes the day and pursues her dreams.  The book ends with historical notes, a chronology, and a selected bibliography that will fulfill any wishes for readers who want to learn more about Wolfgang's older sister.