In this brief description, we will be illustrating the music sequence production system implemented in the software S.Y.MU.S. and Mu.se.s.. This system is based on the use of a music series, intending it like as a module of twelve values not necessarily different between them. Additionally it is to say that the procedures here described are not the result of an abstract formalization. Instead, this is a description of some musical composition procedures, analyzing what this formal scheme has been underlines.
