@afolop
Yes, your earlier reply is a bit sharp, there are people interested in music for whom viol consorts are not a daily encounter- and here in Berlin they are "Gambenconsort" - that is the term I know, and among the first results from a google.de search there is only one entry that also mentions Viol... But my ignorance is not what imslp should take into account.
What I ask is: you should be aware of the fact, that by implementing the global change in the tagging system, you also affect music beyond the renaissance era, and you will find e.g. a Heinichen Triosonata for oboe, viola da gamba and B.C. (not on imslp yet) now with the genre for oboe, viol and continuo - I find this unusual and confusing

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Not that I advocate sticking by the LC cataloging rules

, they are sometimes problematic, but they still have separate subjects e.g. for Sonatas (viola da gamba and continuo) - several... and Sonatas (viol and continuo) - only 2.