Hi,

I would suggest adding "MGG Online" to the whitelist for "other databases".

It's a scientific publication/database which partially keeps its content locked behind a login, but shares a highly useful & informative preview of their articles to anyone.
In academic circles it is one of the major reference points and I noticed (especially in the classical / early music field) they offer information on quite a number of elsewhere obscure composers & musicians from centuries ago, so I definitely consider it worth adding here.

https://www.mgg-online.com/ 

https://en.wikipedia.org/wiki/Die_Musik_in_Geschichte_und_Gegenwart

example:
https://www.mgg-online.com/mgg/stable/19165

cheers