I introduced Mozart in my Intro to Classical Music. Mozart made frequent use of the sonata form, one of classical music’s most important legacies. In his short life, he composed 18 piano sonatas, 36 violin sonatas, and several more for other instruments. Today we consider the third movement of his 11th Piano Sonata, Rondo alla Turca. This allows us to learn about the rondo form and observe the mathematical symmetry that is common to Classical-era pieces.