Re: Creating score with unfolded repeats in scheme

[Hans Aikema]

On 9 Sep 2024, at 23:10, Morten Lemvigh <morten.lemvigh@gmail.com> wrote:

Hi,

I am experimenting with a system to create choir rehearsal midi files. A part of that is to unfold repeats. I have a function that accepts a score and creates a new score. The steps are:

1. Extract the music from the score

2. Unfold the repeats

3. Make a new score 

For some reason only the first note of the score is repeated and I get a

"programming error: Moment is not increasing. Aborting interpretation."

When I try to display-scheme-music of the unfolded music it looks like everything is there, but it is not included in the final score.

I have tried to create a minimal example that reproduces the issue. It is pasted below.

So the question is: what have I misunderstood? :-)

Best regards,
Morten

\version "2.24.2"

choirScore = \score {
    \new Staff {
        \relative c' {
            \repeat volta 2 {
                c d e f
            }
        }
    }
}

make-rehearsal =
#(define-scheme-function
  (the-score)
  (ly:score?)
  (ly:make-score (unfold-repeats-fully (ly:score-music the-score))))

new-score = #(make-rehearsal choirScore)
\new-score

What I found very useful in my case for the rehearsal tracks is the rehearsalMidi function from the openlilylib gridly grit-templates include, which I’ve been using stand-alone in my own (historically grown and improved) choir arrangements.

https://github.com/openlilylib/snippets/blob/master/ly/gridly/grid-templates.ily

As an inspiration here’s how I’ve organised things in my system (which no doubt could be improved):

A folder <songname> per song

Variables for each of the voices’ notes (sopMusic, altMusic etc) and each of the voices lyrics (sopWords, altWords etc) each defined in a file named after the voice (soprano.ily, alto.ily etc)

The main composition file bringing it all together <songname>.ly

```

\version "2.19.3"

\header {

    …

}

\paper {

    first-page-number = 1

}

global = {

    % defines tempo, initial key, time signature

}

\include "soprano.ily"

\include "alto.ily"

\include "tenor.ily"

\include "basso.ily"

\include "../temlates/SATB.ily"

```

Include-files to setup a staff per voice in a templates folder

e.g. for Soprano (soprano.ily):

```

\version "2.22.0"

soprano_Staff = {

    \new Staff = soprano \with {

        instrumentName = "Soprano"

        shortInstrumentName = "S"

    }<<

        \new Voice = "soprano" { \clef "treble"  \global \sopMusic }

        \tag #'lyrics {\new Lyrics \with {alignBelowContext=sopStaff} \lyricsto soprano \sopWords}

    >>

}

```

Include-file for an entire arrangement layout that includes the relevant per-voice templates and then goes on to defined the overall music as the allMusic variable

```

allMusic = {

    <<

        \metronome

        \new ChoirStaff <<

                    \soprano_Staff

                    \alto_Staff

                    \tenor_Staff

                    \basso_Staff

        >> % end of ChoirStaff

>> % end of full system

}

```

Which is then used both to create a full SATB-score sheet music as per

```

\book {

    \bookOutputSuffix "lilypond"

    \score {

        \removeWithTag #'metronome

        \allMusic

        \layout {}

    }

}

```

A tutti-track with all music at regular volume:

```

\book {

    \bookOutputSuffix "tutti"

    \score {

        \unfoldRepeats { \removeWithTag #'lyrics \allMusic }

        \midi {

            \context {

                \Score 

                dynamicAbsoluteVolumeFunction = #hatikwaDynamics

            }

        }

    }

}

```

And per-voice highlighted tracks (using the rehearsal-midi function, which, among others, unfolds the music and lowers the volume of all voices except the voice given as its argument)  e.g. for the soprano group:

```

\rehearsalMidi { \removeWithTag #'lyrics \allMusic } "soprano"

```