A fact from Bach Archive appeared on Wikipedia's Main Page in the Did you know column on 25 January 2011 (check views). The text of the entry was as follows:
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Text and/or other creative content from this version of Peter Wollny was copied or moved into Bach Archive with this edit on 07:37, 11 March 2021. The former page's history now serves to provide attribution for that content in the latter page, and it must not be deleted as long as the latter page exists.
The article was just moved from Bach-Archiv Leipzig to Bach Archiv Leipzig. I don't find support for that on the official website. Btw, the last ref, not well formatted, is no longer in the "news" of that website. --Gerda Arendt (talk) 07:13, 26 October 2015 (UTC)[reply]
re. "I don't find support for that on the official website" - that's because you only look at the German website of the Bach Archive, the English-language version of the website omits all these hyphens ([1])
Whether it's the only one that will have an article at en.wikipedia I don't know, but the Leipzig one would be the WP:PRIMARYTOPIC while by far the most famous one.