Known as the anthem of Józef Piłsudski's Legions (the "March of the First Brigade"), this is arguably the most famous piece of music associated with the movement that grew out of the Strzelcy.
While technically a general infantry song, it is inextricably linked to the Legions and the Strzelcy tradition, often played during patriotic ceremonies. Strzelcy
If you are looking for a definitive musical piece or anthem related to the (Polish Riflemen's Association or the Legions), the most iconic "good piece" is the march "Hej, strzelcy wraz" (Hey, Riflemen Together). The Anthem: "Hej, strzelcy wraz" Known as the anthem of Józef Piłsudski's Legions
For a "piece" of a different kind, the Polish Art Center features historical illustrations and prints like "Kosynierzy i strzelcy" that capture the imagery of these soldiers. The Anthem: "Hej, strzelcy wraz" For a "piece"
Kosynierzy i strzelcy - Soldiers and Riflemen - Polish Art Center