To earn a living, Lutosławski joined as an arranger-pianist "Dana Ensemble", the first Polish revellers, singing in "Ziemiańska Cafe". Then he formed a piano duo with friend and fellow composer Andrzej Panufnik, and they performed together in Warsaw cafés. Their repertoire consisted of a wide range of music in their own arrangements, including the first incarnation of Lutosławski's "Paganini Variations", a transcription of the 24th Caprice for solo violin by Niccolò Paganini. Defiantly, they even sometimes played Polish music (the Nazis banned Polish music in Poland—including that of Frédéric Chopin), and composed Resistance songs. Listening in cafés was the only way in which the Poles of German-occupied Warsaw could hear live music; putting on concerts was impossible since the Germans occupying Poland prohibited any organised gatherings. In café "Aria", where they played, Lutosławski met his future wife Maria Danuta Bogusławska, a sister of the writer Stanisław Dygat.