Abstract: A computer assisted apparatus and a method are provided that represents and describes a musical work in a graphical way, and using outboard devices or the computer keys and mouse, permits experimentation with musical ideas. Musical devices such as fills, suspensions, bends, overall structure, chord sequences, phrases, degrees of consonance and dissonance and melodic motifs and other musical constructions are visualised. In this way, manipulation and experimentation is accessible and an ordered method is provided to musical invention. Operators can build their own library of ideas as well as manipulate and experiment with ideas gathered from other sources. Playback would employ a musical synthesiser. These ideas so attained, when given life through the operator's personal musical style and voice, become integrated with the mental processes in the usual method of acquired musical language. Empowering the functionality of this invention is a unique view of music theory.