In the second half of the 1930s, the choir of the N.I.R. was founded. This choir performed both independently and together with the various orchestras affiliated with the broadcasting company.

The repertoire for choir - a capella and with accompaniment - in the collection is quite large. During the first decades of public broadcasting, for instance, many folksongs were set to music for choir, both for men's, women's and children's choirs and for mixed choir. Composers such as Gaston Nuyts, Arthur Meulemans, Jef Van Hoof, Karel De Brabander and many others wrote adaptations of folk songs and battle songs. The choral work of Vic Nees, who was the conductor of the Radio Choir from 1970 until his retirement in 1996, should also be mentioned here.