Banda 400-tu (Gang of 400) is a school choir founded in 2023, made up of pupils from grades 3–6 of the Maria SkłodowskaCurie Primary School no. 400 in Warsaw. Using project work methodology, the choir prepares topic-based programmes for various occasions. Its main objectives are to sing, to add splendour to school festivities, and to integrate pupils. In the year of its foundation, the choir gave several performances related to various holidays (sometimes with teacher and parent participation), concerts on patriotic subjects, as well as the ceremony ending the school year for grades 4–7. It also represented the school during the 10th Wilanów Talent Show “Szuflada 2024” and held a vocal flash mob for the World Theatre Day, singing great film and musical fairy-tale hits. The choir is conducted by Michał Czubaszek, while Sylwia Malinowska Piątek is responsible for voice projection and programming.