Round A4 up to a multiple of 4 total pages. I can't easily get the number of actual pages processed, so rely on telling the (rather hacky, and surprising - I have to divide to a separate counter to force an integer result) macro the number of pages used before the current numbering started.

This book is for tunes that are not part of the regular
Havoc session or dance repertoire.

Typically these tunes have either fallen out of popularity at sessions,
or are simply tunes that I like.