The pureCMusic (pCM++) framework gives the possibility to write a piece of music in terms of an algorithmic-composition-based program -also controlled by data streaming from external devices for giving expressiveness in electro-acoustic music performances- and of synthesis algorithms. Everything is written following the C language syntax and compiled into machine code that runs at CPU speed. The framework provides a number of predefined functions for sound processing, for generating complex events and for managing external data coming from standard Midi controllers and/or other special gesture interfaces. I’m going to propose pCM++ as open-source code.