CatQuest mentioned the Brazilian "bateria" as something he would want to add to MusicBrainz to be able to indicate a lot of instruments are part of it, but which doesn't really match the current options as it's not really an instrument in itself. This reminded me that we're still using "strings [string quartet]" and stuff like that for other standard group combinations. And we thought we'd like to create a new type of "instrument" (name may be "grouping"?) for these kind of groupings, that would allow us to state, for example, "string quartet includes violin, viola, cello".
I would eventually want to merge orchestra into the instrument list, same as with vocals (STYLE-609), to have just one "performed" relationship. This would help with that