Torsten Anders

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This research presents the design, usage, and evaluation of a highly generic music constraint system called Strasheela. Strasheela simplifies the definition of musical constraint satisfaction problems (CSP) by predefining building blocks required for such problems. At the same time, Strasheela preserves a high degree of generality and is reasonably(More)
Strasheela provides a means for the composer to create a symbolic score by formally describing it in a rule-based way. The environment defines a rich music representation for complex polyphonic scores. Strasheela enables the user to define expressive compositional rules and then to apply them to the score. Compositional rules can restrict many aspects of(More)
Modeling music theories with computer programs has attracted composers and scholars for a long time. On the one hand, the resulting programs can serve as algorithmic composition tools. On the other hand, such an approach leads to a better understanding of existing as well as newly developed theories, which in turn can lead to a better understanding of(More)
Constraints programming allows the composer to synthesize a score by describing it. Arno is a program for computer assisted composition which extends Common Music (CM) by means of constraints programming using Screamer. In Arno parameters of CM elements in a CM container can be declared nondeterministically using finite domains — instead of single values.(More)
Constraint programming is well suited for the computational modeling of music theories and composition: its declarative and modular approach shares similarities with the way music theory is traditionally expressed, namely by a set of rules which describe the intended result. Various music theory disciplines have been modeled, including counterpoint,(More)
This paper proposes an approach for constraint-based algorithmic composition in realtime. To our knowledge, constraint programming – which performs a search – has not been used for music composition in realtime before. The main contribution of this paper is a meta-solver with a timeout. We decompose the music creation process into one sub-constraint-problem(More)
This paper studies how constraints are applied to the score in a musical constraint satisfaction problem (CSP). How can we control which variable sets in the score are affected by a given constraint? Our overall objective is to produce a highly generic music constraint system, where users can define a wide range of musical CSPs, including rhythmic,(More)
This paper presents a formal model of Schoenberg’s guidelines for convincing chord root progressions. This model has been implemented as part of a system that models a considerable part of Schoenberg’s Theory of Harmony. This system implements Schoenberg’s theory in a modular way: besides generating four-voice homophonic chord progressions, it can also be(More)