Composing interactive virtual operas

Abstract

In this paper we present our research about a new genre of lyric works, called virtual interactive operas. Part of its results are used in the composition of an interactive opera called "Virtualis".To achieve interesting hypermedia interaction in a musical context, we show that it is necessary to use a description language and we give some specifications of the one used. Using this language enables the creation of graphical metaphors of structural elements of music, with the help in the future of the EMMA metaphor builder system. We then describe the ALMA authoring system we have been developing to implement hypermedia musical compositions. Keywords Virtual interactive operas, hypermedia authoring system WHAT ARE VIRTUAL OPERAS? We define as a virtual opera any lyric work implemented on a personal computer [4][5][6], enabling some interactivity with its audience. This new genre is not based on the simple transposition of existing operas in the tiework of new computing technologies; it takes into account the shiftings of uses and meanings induced by multimedia computing, assuming they could arouse new writings, including the lyric field. Interactivity is based on free choices among different paths. Only open forms [IO] that have specially been designed for listeners can enable it. This specification leads us to give up the classical narrative "aristotelician" mode [12][18]. This implies two possibilities of formal and temporal articulation : . either consider the hypertext model and possibilities of automatic text generation [2] to design an opera where hypermedia components strongly depend on text; this is the case in Jean-Pierre Balpe's BarbeBleue project, .or take into account the specificities of computeraided writing to design a new kind of "musical action" as Luciano Berio [3] defined it : "Between a musical action and an opera, there are substantial differences.

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