| 41. | There are also piano works that are from Bart�k's first and second set of opus numbers.
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| 42. | Hausmann's own compositions are now completely forgotten, but they included at least 41 opus numbers.
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| 43. | Within each group there are first works with opus number and then the works with an EM code.
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| 44. | This way it could happen that the same opus number was given to more than one of his works.
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| 45. | In other cases, the same work was given as many as three different opus numbers by different publishers.
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| 46. | The true tally is well over 500 surviving works since many opus numbers comprise two or more distinct works.
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| 47. | This work, one opus number, was printed in Amsterdam in 1712 by the famous publisher Estienne Roger.
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| 48. | :: See Catalogues of classical compositions # Opus numbers for some reasons why opus numbers will not do.
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| 49. | :: See Catalogues of classical compositions # Opus numbers for some reasons why opus numbers will not do.
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| 50. | This work was never given an opus number, and only the scherzo seems to have ever been published .)
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