For which instrument did this German composer write a textbook, whose portrait was painted by Pietro Lorenzoni in 1765?
Pietro Antonio Lorenzoni Pietro Antonio Lorenzoni (1721–1782) was an Italian painter who is believed to have painted several portraits of Wolfgang Amadeus Mozart and his family: "The Boy Mozart" (1763), his sister Maria Anna Mozart in "Nannerl as a Child" (1763) and a portrait of their father Leopold Mozart (c. 1765). He arrived in Salzburg, Austria in the 1740s and first wanted to paint Wolfgang and Nannerl. His protégé, Johann Nepomuk della Croce, painted a Mozart family portrait in 1780.
Pietro Nardini Pietro Nardini (April 12, 1722 – May 7, 1793) was an Italian composer and violinist, a transitional musician who worked in both the Baroque and Classical-era traditions.