[itsme]

Back to technical details:
What I keep in my index XLS's and the database, see the Firehouse Jazzband example:
Index - the index as listed in the books TOC
in case of the above example it's a song number, in most cases it's a page number and I came across a book that has genre chapters that skip a number of pages after every chapter to allow sorting in more songs in a later edition to the correct chapter without changing all the page numbers
PDFPage - the starting page in the PDF as required for MSP page order or PDF exploder
PDFLastPage - the last page of the song in the PDF, filled only for songs with more than one page
IMHO it makes sense to keep it per song in the XLS so that it is in place when the XLS is sorted alphabetically by title
PageOrder - what MSP needs to access the songs correctly
mostly calculated by Excel macros with individual corrections for e.g. mixed up pages
AlternativTitel - allows a second title entry
useful for e.g. Autumn Leaves = Les Feuilles Mortes, Manha de Carnaval = Black Orpheus = Orfeo Negro and so on
Titel and Key do not need t be explained.
I usuallly do not maintain composer, year, genre and more. For me that's not important enough to be worth the effort. Anybody's welcome to add more...