Landscape printing

[Wol]

I'm having fun trying to get things to print landscape. Okay, I'm doing 
"monkey see monkey do" programming, but I have two apparently almost 
identical files, one of which prints landscape, the other portrait.

Even worse, putting the stuff in the paper block seems to be completely 
ignored. Okay, part of it is confusion between "set-paper-size" and 
"set-default-paper-size", but at the end of the day, nothing makes 
sense. I attach two "part" files which are almost identical. Both have 
set-default-paper-size in the layout block. Both are physically 
portrait, but Grandioso (the one I'm working on) is fully portrait. 
Colonel Bogey is on its side, so it's effectively landscape that's been 
rotated 90 degrees.

Okay, my ideal scenario would be to have the page properly landscape, 
but I can't even get the music to rotate on the page ... is there 
anything obviously different and wrong with Grandioso compared to 
Colonel Bogey?

The other ideal scenario would be to actually understand what's going on 
:-) I've read the manual 
https://lilypond.org/doc/v2.25/Documentation/notation/setting-the-paper-size 
but like most man pages it probably only makes sense once you already 
understand it ...

(Comment out bookTitleMarkup - I've just redefined/overridden the 
standard one to give a Brass Band header rather than an orchestral header.)

Cheers,
Wol

partTromboneI.ly
Description: Text Data

voiceStaff.ily
Description: Text document

voiceTrombone.ily
Description: Text document

partTromboneI.ly
Description: Text Data