The present invention provides a complete orchestration system to generate melodic lines of any length in real time to provide a new musical accompaniment with no repeated phrases each time a particular style is played, and which can generate accompaniment styles played by groups of any size up to full symphony orchestras. It instructs a computer processing unit to compose and orchestrate a particular style of music by merely describing, to the orchestration system, the attributes of that style. An original musical score can be generated and performed that can be synchronized to the scenes in a video production to provide a complete orchestration video system.