This interdisciplinary document examines the intersection of art and music during the fin-de-si¿¿¿¿cle in Paris and Vienna, with particular emphasis on the convergence of Art Nouveau with the symphonic genre. It relates the more fluid Art Nouveau of Paris with the more geometric Jugendstil and Sezessionstil styles of Art Nouveau that emerged in Vienna, and explores the reciprocal influence of each in the development of the symphony during the fin-de-si¿¿¿¿cle. Four symphonic works that span the height of the Art Nouveau era are examined in detail, including the Symphony in B-flat major (1890) by Ernest Chausson (1855-1899), the Symphony No. 3
in B-flat major (1897) by Alexander von Zemlinsky (1871-1942), the Symphony No. 2 in B-flat major (1902-3) by Vincent d'Indy (1851-1931), and the Symphony No. 7 (1904-5) by Gustav
Mahler (1860-1911). Through an analysis of the shared Art Nouveau characteristics of each, a new lens for understanding and contextualizing these works is proposed.