Fieldwork with the aim of recording the overall repertoire of a Banda-Linda horn ensemble led me to the study and analysis of the shapes in which this particular type of orally-transmitted multipart music functions. Among the Banda-Linda – about 27,000 people residing in a wooded savanna region in the heart of the Central African Republic – horn orchestras are associated with the rites of passage of young boys. They comprise from 10 to 18 instruments whose sizes vary from 30 to 180 cm., and one pair pellet-bells (see Figs. 1 and 2 in the appendix). The 6 highest-tuned instruments, made of antelope horn, have a lateral mouthpiece while the rest, made of wood, are end blown. The repertoire of such orchestras includes about 15 pieces, all of w...