Lang Maria de
Maria de Lang (*?-†?) amateur composer active in the first half of the 19th century. Maria Szymanowska dedicated her piece to her entitled “Divertissement pour Pianoforte avec accomp. de violon” (link). Her compositions include Marche in C major for piano (published in 1822 in Warsaw, currently in the collection of the National Library of Russia) and Cotillion for piano (published in 1820 in Warsaw).