Patent ID: 7470853

Claim:
A musical composition processing device which detects tonal information indicating a musical tone of a musical composition for a predetermined musical composition, comprising: an appearance probability acquiring section for acquiring a distribution showing appearance probabilities of respective pitch names included in at least a portion of the predetermined musical composition; a template storing section for storing templates, which are different from each other, each template corresponding to a type of the musical composition and representing a distribution showing appearance probabilities of respective pitch names included in the type of the musical composition; a load ratio calculating section for calculating load ratios, each indicating a ratio of the distribution, which is represented by each of the templates stored in the template storing section, to the distribution acquired by the appearance probability acquiring section; and a tonal information detecting section for detecting, as the tonal information, a load ratio set comprised of the load ratios, respectively corresponding to the templates, which are calculated by the load ratio calculating section.