Nominator's rationale: Fails trivial intersection criterion. Any music involving trumpets earlier than about 1800 was written for natural trumpet (see Natural trumpet). Thus even a category Category:Compositions with natural trumpets would be highly dubious. Acceptance of this category would also open the way for categories such Category:Compositions with violins which would include e.g. every symphony ever written. The items in this category btw are not specifically music for trumpet, they are works for choir with instrumental accompaniment (including various other instruments). The present category however is even more random than Category:Compositions with natural trumpets would be, selecting music in D major only. There is no referential category which sets D major music including trumpets apart from music in other keys (or from music for other instruments which happens to be in the same key). This is just a random category with no encyclopaedic purpose. Btw it appears (from the discussion there) that the category was created in a fit of pique at this discussion at WikiProject Classical Music Talk, in which case it may also be an example of WP:POINT. The discussion there, which was inconclusive, dealt with the inappropriateness or otherwise of the set of 24 categories [[:Category:Compositions in [key]]]. I wasn't originally going to bring that topic to CfD, but in the light of the potential enormous expansion of pointless categories which Category:Compositions with natural trumpets in D major could unleash (20 or 30 instruments x 24 keys applied to virtually every piece of music ever written), editors may care to comment on Category:Compositions by key and its sub-categories, and if it is thought appropriate I will bring that set of categories here for discussion. Smerus (talk) 17:45, 24 January 2015 (UTC)[reply]
As to the content of the matter, the scholar reference that sets compositions "with natural trumpets in D major" apart was given in the other discussion: Stockigt, Janice B. (2013). "Bach's Missa BWV 232I in the context of Catholic Mass settings in Dresden, 1729–1733". In Tomita, Yo; Leaver, Robin A.; Smaczny, Jan (eds.). Exploring Bach's B-minor Mass. Cambridge University Press. pp. 39–53. ISBN978-1-107-00790-1. {{cite book}}: Invalid |ref=harv (help) – p. 46 middle of the page is what you'd be looking for. --Francis Schonken (talk) 18:49, 24 January 2015 (UTC)[reply]
Francis, perhaps you can explain your reference. The one you cite (p. 46 of Smaczny) contains as far as I can see just a reference to trumpets in D in music by Zelenka. It does not in any way make any scholarly characterization of music in D major for natural trumpets, and therefore provides no basis for a category (in which, as it happens, none of the articles categorized are about music by Zelenka). Btw readers of the original discussion (which did not and does not debate this particular category as you claim) can form their own conclusions as to whether or not I had 'little or no support'; and to accuse another editor of 'running away', whether justified or, as in this case, not, is rather bad form.--Smerus (talk) 20:33, 24 January 2015 (UTC)[reply]
It's about the region (Saxony), for which Zelenka (and Bach, and Caldara, etc.) are only examples.
Dear Francis, not even your forceful personality can command me never to change my mind :-) But in the present case, I never made any comments on this category one way or another before posting this CfD --Smerus (talk) 14:54, 25 January 2015 (UTC)[reply]
Oculi, I suggest that upmerge to Category:Compositions for trumpet is not appropriate, as that category is not a true parent of the category under discussion. The music in the category under discussion is not 'for' trumpet, it is 'with' trumpets - and with other instruments and voices. If categories 'Compositions for' are going to be broadened to imply 'Categories including' they become I think meaningless.--Smerus (talk) 20:19, 24 January 2015 (UTC)[reply]
Although I personally am not too happy about 'Composition in [key]' categories, I would support upmerge as above as a resolution of this category. See below--Smerus (talk) 06:45, 25 January 2015 (UTC)[reply]
OK, so this is a category without any valid parents, in which case it is ridiculous rather than trivial and should be deleted. Oculi (talk) 11:46, 25 January 2015 (UTC)[reply]
Upmerge This seems like a subdivision too far. I support categorisation of compositions by key. I can also see the use of compositions with natural trumpets. However, this category covering compositions in the key of D simply with and not for natural trumpets is far too narrow a definition to aid navigation. I'm not sold on the fact that such compositions are a uniquely notable variety, compared to, say, compositions with natural trumpets in E minor. I support an upmerge to the Category:Compositions in D major, but I'm also not opposed to creation of a parent category through an upmerge to Category:Compositions with natural trumpets if people feel that is a useful one to have. A much better way of subdividing material from the key category would be by genre (as tried at Category:Jazz compositions in D major) or by classical composition type (e.g. Cantata). These types of categories will gather articles with a much higher relevance to each other than the model of the nominated category. SFB11:57, 25 January 2015 (UTC)[reply]
Delete: This category should be deleted. Almost all pieces ever written using natural trumpet are in either the key of D or the key of C, because those were the only keys for which these trumpets were manufactured (unlike modern valve trumpets, which can play a chromatic scale and therefore in any key). Baroque composers chose their key according to the instrument they had on hand; there was no musically notable difference between the pieces written in C and those in D. Francis, this case is substantially different from the case of the category "Pieces in the key of [x]", because there are those who claim that composers saw different musical significance in different keys. That is not the case here - the keys were chosen for purely technical reasons. --Ravpapa (talk) 13:46, 25 January 2015 (UTC)[reply]
Rename-- A natural trumpet is only able to produce a limited range of notes. There could in principle be natural trumpets, of a different size in other keys. A D-major natural trumpet would not be able to play some of the notes required by a piece in E major. Category:Compositions for D-major natural trumpets would probably fulfill the objective. Peterkingiron (talk) 22:28, 25 January 2015 (UTC)[reply]
@Peterkingiron: Unfortunately for your proposal, the pieces in this category are not 'Compositions for D-major natural trumpets' - they are pieces for choir and orchestra, (the latter including D-major natural trumpets, amongst other instruments).--Smerus (talk) 07:05, 26 January 2015 (UTC)[reply]
Nominator's rationale: Very few "membership" cats are defining and this one is no exception: membership in this federation is absolutely not defining for any of the organizations listed. Randykitty (talk) 13:03, 24 January 2015 (UTC)[reply]
Delete -- affiliation to an international body is not notable. The individual organisations should be categorised as to the field in which they operate - as anti-cult organisations. Peterkingiron (talk) 22:33, 25 January 2015 (UTC)[reply]
