Multimedia scenarios have multimedia content and interactive events associated with computer programs. Interactive Scores (IS) is a formalism to represent such scenarios by temporal objects, temporal relations (TRs) and interactive events. IS describe TRs, but IS cannot represent TRs together with conditional branching. We propose a model for conditional branching timed IS in the Non-deterministic Timed Concurrent Constraint (ntcc) calculus. We ran a prototype of our model in Ntccrt (a real-time capable interpreter for ntcc) and the response time was acceptable for real-time interaction. An advantage of ntcc over Max MSP or Petri Nets is that conditions and global constraints are represented declaratively.
This paper presents the computer-assisted composition environment OpenMusic and introduces OM 5.0, a new cross-platform release. The characteristics of this system will be exposed, with examples of applications in music composition and analysis.