For many years, the Orchestra has been the largest ensemble of the school. The long-term contribution of conductors such as Jerzy Śródkowski, Mirosław Jacek Błaszczyk, and above all Mieczysław Szymański (who worked with the orchestra for 24 years), as well as his successor Roman Zieliński (1992–2009), has created an artistic image of the Orchestra as one of the school’s trademarks. Its large ensemble, including many percussion instruments and harp, has allowed for the performance of a wide symphonic repertoire (M. Ravel’s Bolero and Alborada del grazioso, G. Bizet’s L’Arlésienne, and Rachmaninoff’s Piano Concerto No. 2).
The orchestra’s performances every year enrich the School Festival and the annual “Spring of Artistic Youth” concert series. Since September 2009, the orchestra has been under the direction of Kazimierz Dąbrowski. In recent years, the ensemble has enriched its repertoire with oratorios performed with the school choir and choirs from other schools and institutions in Białystok, showcasing works by composers such as K. Szymanowski (Stabat Mater), J. Rutter (Magnificat, Mass of the Children), M. Bembinow (Amor Vincit, Res Tua, New Objects in Q), and K. Jenkins (A Mass for Peace, Requiem). One of the most significant events in the orchestra’s life was the world premiere of the ballet The Missing Link by A.M. Huszcza performed together with the Non-Public School of Dance Art in Białystok, as well as the annual stage projects that summarize each year of the school’s activities (e.g., the musical Pinokio [Pinocchio] by Szczepan Godziemba-Trytka, the vaudeville Krakowiacy i Górale [Cracovians and Highlanders] by Józef Stefani, and the Mozartiada directed by Ryszard Supiński). In recent years, the orchestra has also made appearances in Norway and Slovenia. In 2021, the orchestra was conducted by Jerzy Maksymiuk in Ludwig van Beethoven’s Symphony No. 1 during the anniversary concert.