A vocabulary, or music ontology, to describe classical music and performances. Classes (categories) for musical works, events, instruments and performers, as well as related properties are defined. Make sure to distinguish musical works (e.g. Opera) from performance events (Opera_Event), or works (String_Quartette) from performer (StringQuartetEnsemble in this vocab), whose natural language terms are used interchangeblly. The present version experiments more precise model to describe a musical work, its representations (performances, scores, etc) and a musical event to present a representation (a concert). Includes 30 keys as individuals. @en, 音楽作品、楽器、演奏情報を記述するためのボキャブラリ。Opera_Event（演奏）とOpera（作品）や、String_Quartette（作品）とStringQuartetEnsemble（団体）のように、日常語では両方の意味に使われるクラスの区別に注意。このバージョンでは、音楽作品、その表現（演奏、楽譜など）とイベント（演奏会）をより精密にモデリングするべく実験中。 @ja
