1956 was a year of transition in Poland, and an important year for Polish music. This year saw the beginning of a political thaw - sometimes called the Polish October - in communist Poland. It was also the year of the establishment of the 'Warsaw Autumn' International Festival of Contemporary Music. This was a time of great artistic ferment in Polish music, which also deeply influenced symphonic thinking. The year 1956 is thus an appropriate starting point for Beata Boleslawska's study of the contemporary Polish symphonic tradition. Boleslawska investigates the influential Polish avant-garde, illuminating the ways in which new musical means and ideas influenced symphonic music and the genre of the symphony in the music of such important composers as Witold Lutoslawski (1913-1994), Henryk Mikolaj Górecki (1933-2010) and Krzysztof Penderecki (b. 1933). Referring to the main elements of the European tradition, as well as examining briefly the symphonic activity in Poland before 1956, the book concentrates on the symphonic writing in the context of avant-garde trends, represented by the so-called 'Polish school of composers', as well as on its later redefinitions proposed by Polish composers up to the present day.