Page turning in song book: Only \scores with more than 1 page should be forced to start on even page number

[Johannes Maibaum]

Hello,

I am working on a lead-sheet song book (i.e. one \book with many short
\scores inside), and I was looking for a way to optimize page turning
for musicians playing tunes from the book. Most songs fit on a single
page, but there are a few songs which span 2 or more pages.

I want to make sure that all songs which more than 1 page start on an
even page, but all 1-page songs should be allowed to start on an even or
an odd page.

Looking through the documentation, and testing the built-in page-
breaking algorithms, there doesn't seem to be a turn-key solution for my
use-case. The default optimal-breaking algorithm starts every \score on
the next page (even or odd), and page-turn-breaking forces every \score
to start on an even page, which causes (almost) blank pages (the last
line is put on the odd page) after all tunes which would happily fit on
1 page.

I tried fiddling with the different blank-page-*-penalties, but so far I
wasn't able to achieve my goal. Is it possible after all?


Best,
Johannes