 Complete the following phrase:  Military service followedLutosławski was trained in signalling and radio operating in Zegrze near Warsaw. He completed his Symphonic Variations in 1939, and the work was premiered by the Polish Radio Symphony Orchestra conducted by Grzegorz Fitelberg, and this performance was broadcast on radio on 9 March 1939. Like most young Polish composers, Lutosławski wanted to continue his education in Paris. His plans for further musical study were dashed in September 1939, when Germany invaded western Poland and 