Re: that migrating "opus"

[David Wright]

On Thu 08 Mar 2018 at 16:17:16 (-0800), Mark Stephen Mrotek wrote:
> I am setting a Haydn piano sonata
> \version "2.19.80"
> \header {
>   title = "Sonata"
>   composer = "F. J. Haydn"
>   opus = "XVI:6"
> }
> \include "XVI-6-1.ly"
> \pageBreak
> \include "XVI-6-2a.ly"
> \pageBreak
> \include "XVI-6-2b.ly"
> \pageBreak
> 
> As expected the "opus" migrates to each and every score. The documentation
> states:  "only piece and opus fields are printed by default in Score
> Titles."
> 
> Since I have not, in my limited experience, seen an opus number on each
> movement that I have read, I am asking for the rational/purpose for having
> the opus migrate.

If I've got hold of the right end of the stick, imagine
you're setting the Brahms opus 118 Klavierstüke, then
you would label the six scores thus:

1: piece=Intermezzo, opus=opus 118 no 1
2: piece=Intermezzo, opus=opus 118 no 2
3: piece=Ballade,    opus=opus 118 no 3
4: piece=Intermezzo, opus=opus 118 no 4
5: piece=Romanze,    opus=opus 118 no 5
6: piece=Intermezzo, opus=opus 118 no 6

Cheers,
David.