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This article gives some details of the various catalogues of classical compositions that have come into general use. ==Opus numbers== While the opus numbering system has long been the standard manner in which individual compositions are identified and referenced, it is far from universal, and there have been many different applications of the system. Very few composers gave opus numbers to all of their published works without exception: * Some composers used it for certain genres of music but not for others (for example, in Handel's time, it was normal to apply opus numbers to instrumental compositions but not to vocal compositions such as operas, oratorios, etc.). * Some composers gave opus numbers to some of their early compositions but abandoned the practice after some time (examples include Debussy and Hindemith). * Some used it in a very erratic manner, or were subject to the wishes of their publishers, who for commercial reasons often presented works with opus numbers that bore little relationship to their place in the chronological sequence of the composer's works. In cases such as Schubert and Dvořák, one opus number could refer to a number of different works; or a single work could appear under different opus numbers. * Some composers abandoned their early compositions and restarted the opus numbering sequence. Some did this more than once. For example, Bartók three times started numbering his works with opus numbers. He stopped the system in 1921 because of the difficulty of distinguishing between original works and ethnographic arrangements, and between major and minor works. * A few composers allowed superstitious considerations to override chronological specificity in numbering: Massenet, for this reason, published an "Opus 12B" but not an "Opus 13." There are cases where works that a composer chose not to publish were published after their death and assigned very late opus numbers that often give a misleading idea of their order of composition (cases include Mendelssohn, Chopin and Tchaikovsky). Other composers simply never used opus numbers at all (examples include Copland, Vaughan Williams and many other 20th-century composers). In some cases, the opus numbers that were established during the composer's lifetime are still used, but symbols from alternative comprehensive catalogues are used for unpublished works or works that have come to light since the composer's death. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Catalogues of classical compositions」の詳細全文を読む スポンサード リンク
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