Well... let's see. Speaking purely in musical terms I love French mélodies... Berlioz, Gabriel Fauré, Debussy, Ravel, Poulenc, etc... I am also starting to dig deeper into French Romantic opera: Massenet, Bizet, Chabrier, Berlioz, Gounod, Offenbach, etc... as well as older operas in French: Rossini's Guillaume Tell, Gluck's Iphigénie en Aulide, Armide, Alceste, Echo et Narcisse, and Orphée et Euridice as well as the operas of Lully and Rameau.
Having said this... on the side of German-language music we have the cantatas of Bach and Buxtehude, Mozart's Die Entführung aus dem Serail, Der Schauspieldirektor, and Die Zauberflöte. Joseph Haydn's Die Schöpfung, Die Jahreszeiten, and Die sieben letzten Worte unseres Erlösers am Kreuze, Beethoven's lieder, Fidelio, and of course Ode an die Freude, Schubert's lieder, Schumann's lieder, Carl Maria von Weber's Der Freischütz, Hugo Wolf's lieder, Johannes Brahms' lieder and Ein deutsches Requiem, Richard Wagner's operas, Gustav Mahler's orchestral songs and vocal passages from the symphonies, Richard Strauss' operas, lieder, and orchestral songs, the operettas of Johann Strauss II, Franz von Suppé, and Franz Lehár, Arnoold Schoenberg's Gurrelieder, Alban Berg's lieder as well as Wozzeck and Lulu, Joseph Marx lieder, orchestral and choral songs, Engelbert Humperdinck's Hänsel und Gretel, Erich Korngold's Die tote Stadt and Das Wunder der Heliane, Alexander von Zemlinsky's Der Traumgörge, Eine florentinische Tragödie, Der Zwerg, etc..., Franz Schreker's Die Gezeichneten and Der Schatzgräber, etc..., Hans Pfitzner's Palestrina, operas and other vocal works by Kurt Weill, Paul Hindemith, Ernst Krenek...
I have to go with the Germans