that migrating "opus"

[Mark Stephen Mrotek]

Hello,

 

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.

 

Thank you for your kind attention.

 

Mark