Re: how can I abstract the application of \hideNotes and \unHideNotes

[Kieren MacMillan]

Hi Lukas,

We have a winner!

%%%
\version "2.25.33"

forceContext =
#(define-music-function (context-id mus) (string? ly:music?)
   (music-map
    (lambda (m)
      (if (eq? (ly:music-property m 'name) 'ContextSpeccedMusic)
          (ly:music-set-property! m 'context-id context-id))
      m)
    mus))

music_only =
\new Staff <<
  \new Voice = "sop" {
    \voiceOne
    c''4 4 4 d''
  }
  \\
  \new Voice = "alt" {
    \voiceTwo
    c''4 b' a' g'
  }
>>

hider = \context Bottom {
  s4 \forceContext "sop" \hideNotes s2 \forceContext "sop" \unHideNotes
}

\score {
  << \music_only \hider >>
}
%%%

Thanks!!
Kieren.

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