[Calliopeguy]

It depends a lot on how detailed you want to get. The Song tab is the basic library, it contains all of the loaded songs. The rest of the tabs are subsets of the Songs tab. I use: Albums for each paper book Identified by the book title; Collections for major groupings of songs, like band (group) 1, instrument 1, etc.; Setlists to specific gigs.  For annotations I either make a copy of the original or use the same annotations for all groups. For different versions I add an identifier to the title, ie., song, song ah, song md, song vo, etc. Of course I end up with multiple copies of a song in the main library but that's ok.
There some folks use multiple basic libraries which is more than I want to mess with, I'm a hobbiest and only need simple.

Thanks for all your info. Very helpful.