Re: What is the difference between \paper and \layout blocks?

[Lukas-Fabian Moser]

> I don't see that.  layout/midi are different output media.  paper has
> some overarching information (like base file names).  It also contains
> some information pertinent to typesetting a whole document as opposed to
> single scores, like paper dimensions.  Things like staff sizes are a
> whole lot murkier, and developers have been scratching their head about
> making things like layout-set-staff-size work in a sensible manner, if
> at all.

Relatedly, there's still 
https://gitlab.com/lilypond/lilypond/-/issues/1885: A 
system-system-spacing set in a \layout block actually is being heeded, 
but ...

\version "2.24"

\score {
  {
    \repeat unfold 500 c'4
  }
  \layout {
    system-system-spacing.padding = 20
  }
}

\score {
  {
    \repeat unfold 200 c'4
  }
  \layout {
    system-system-spacing.padding = 0
  }
}

... see page 3. So the setting seems to be used on a per-page basis, but 
conceptually it should work per-score I think.

Lukas