Other composers simply never used opus numbers at all (examples include Copland, Vaughan Williams and many other 20th-century composers).
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The most recent catalogue is that of László Somfai; this is a chronological index with works identified by BB numbers 1 to 129, incorporating corrections based on the Béla Bartók Thematic Catalogue.
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For Domenico Scarlatti, the Longo catalogue (L numbers) was in use from 1906, and although it has become generally superseded by the 1953 Kirkpatrick catalogue (K or Kk numbers), L numbers are still seen in references.
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