Reynaldo Hahn - Variations on a Theme by Mozart for Flute and Piano. Reynaldo Hahn (1874–1947) was a Venezuelan-born French composer, conductor, singer, and pianist whose elegant, lyrical style was deeply rooted in the French musical tradition. His Variations on a Theme by Mozart for flute and piano showcase his gift for refined melody and graceful ornamentation, treating Mozart’s theme with a distinctly French elegance and harmonic subtlety.