The Gymnasium Carolinum Osnabrück has an adult choir. Two school choirs should be mentioned. In the first sing the students in classes 8-13. The director is Ansgar Schönecker. In addition, a new school choir was established in 2004-2005 in Classes 5-7, which currently consists of about 70 singing pupils (Directors: Jutta Albrecht-Laaff and Nina Witte). As a speciality, there are still at the school Carolinum Cantat, in which parents, teachers, alumni and friends are gathered to support the school choirs.
For the "big" music performances all the choirs are combined under the direction of Ansgar Schönecker. In this way, many successful concerts have been given in recent years. In addition, the choirs appear in many school sacred services.