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Make different collections, one for singing, one for band and one for organ. They all use the same primary library, with no extra effort to maintain different libraries [path = xxx/yyy/zzz/library to xxx/yyy/zzz/library/vocal. xxx/yyy/zzz/library/band vs xxx/yyy/zzz/library-1 [vocal], xxx/yyy/zzz/library-2 [band]]. only one or the other can be installed.
I'm pretty sure that's the basic way it works.