The purpose of this research is to define methods of applying extra-musical and data-based systems in multimedia music works. The first part of the paper concentrates on the outline of the motivation and reasoning for using extra-musical systems from a composer's or sound artist's perspective and gives a historical precedent context. Parallels are drawn together with contemporary art and art critique examples. The second part of the research outlines the possible modes of the data-based systems application by analysing multiple multimedia works by composers or sound artists written in the last two decades including a piece by the author of the paper. The types of multimedia and its connection to sound are discussed, the conceptual deconstruction and its semiotic implications of the data used are analysed. The given conceptual and semantic context is applied for analysing the musical parameters and data's usage in sound control. Each of the pieces discussed outlines a particular mode of the conceptuality towards the extra-musical system usage and functions as a primal device for further conclusions drawn. The final part of the research consists of the general overview of the conclusions drawn and attempts to establish a general outline of the motivation and the resulting outcome behind the usage of the extra-musical systems in multimedia works.