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Opus (Latin 'work') numbers are assigned to the compositions of many composers as they are published and/or composed. They may provide a fairly reliable indication of when a work was written, but there is a lot of variation in how they have actually been used. Many composers' works have no opus numbers, or randomly-allocated numbers. Often their compositions have been analysed and catalogued by other people in chronological, or some other logical, order, and those catalogues may take the name of the cataloguer. Hence, for example, Mozart's compositions have Köchel numbers, Haydn's have Hoboken (or Hob) numbers, and Schubert's have Deutsch numbers.

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15y ago

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