In music rondellus is the formalized interchange of parts or voices according to a scheme, often used in English conducti and frequently in English motets of the late thirteenth and early fourteenth centuries, but never used for an entire piece . For example: A B C D E F C A B F D E B C A E F D where the italicized letters represent music with text and the other letters are melismatic . See also Round (music) Sources Further reading Musical techniques