A quantum-like semantic analysis of ambiguity in music

Is it possible and interesting to analyze ambiguity in music by means of logical methods? We give a positive answer to this question in the framework of an abstract semantics suggested by the theory of quantum information. The concepts of quantum superposition and of entanglement are used for a formal representation of musical thoughts, which are dealt with as a kind of holistic intensional meanings. We discuss, in particular, the following subjects: (1) the abstract concept of musical theme. (2) The critical relationship between text and music in the case of Lieder. (3) The semantic role of Leitmotive in Wagner' s operas.