The Years 1–3 Choir is the junior section of the school’s Warsaw  Thunderclaps Choir, which has represented the school at artistic and cultural events for 23 years. Małgorzata Czajka founded  the choir and remains its conductor.

Numbering 40 pupils, the Years 1–3 Choir has won awards at  numerous competitions and music festivals. Since 2022, it has  taken part in the nationwide Singing Poland programme. It performs regularly at local events and on professional concert stages,  including Polish Radio’s Witold Lutosławski Concert Studio in  Warsaw. Energy, commitment, and the sheer pleasure of making  music together are hallmarks of the ensemble, whose aim is to  foster in its youngest members a lasting enthusiasm for music  and choral singing.