[samibe]

A potential alternative:
- load all the music for both groups into the same mobilesheets library.
- add a couple fields to the 'Collections' tab. ('_Country', '_Soul-Blues-Jazz') The space at the beginning keeps them at the top of the list (easy to find).
- set the 'Collections' tab to be the default when mobilesheets starts. (Settings > Initial Library Tab)
- assign all songs in the database to one, the other, or both collections.

This gets you something similar to separate libraries without having to commit to one or the other.