Welcome to Wikidata, Daniele.Brundu!
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Hey Daniele, thanks for your work completing the catalogue numbers of the works by Chopin. Some time ago I asked how to do a query to display in a table all the values of the catalogues we already have, you can see it here (it is the second one): Wikidata:Request_a_query/Archive/2016/11#List_of_Chopin_works_with_catalogue_numbers. I hope you find it useful.--Micru (talk) 19:32, 16 January 2017 (UTC)
- Great! If you take a look at the query you will notice that there are some errors. For instance in preludes like Prélude no. 1 in C major, op. 28 (Q16739689), the Chominski catalog number has been labeled as Brown. Also for Mazurkas, Op. 7 (Q6799062), the Brown catalogue number provided does not appear in the reference given, probably it has none.--Micru (talk) 08:28, 17 January 2017 (UTC)