Re: Multi Measure Rests in Cadenzas

[Rupert Marshall-Luck]

Hallo Calvin,

(First time posting here - I hope this works!)

I've found the following (based on https://lsr.di.unimi.it/LSR/Snippet?id=836) 
works well in this sort of situation. The function `cadenzatoMetre` takes two 
music expressions as arguments. The first denotes the rhythmic "frame" within 
which you want the cadenza placed - this can be a rest or a set of pitches: the 
actual content of the expression doesn't matter as it isn't printed by the 
function; it just serves as a reference. The second argument is the cadenza 
itself.

The function calculates a "scaling factor" based on the metrical lengths of the 
two arguments and uses the function `ly:music-compress` to scale the cadenza 
accordingly.


% Example begins
% ===============
\version "2.24.1"

cadenzaToMetre =
#(define-music-function (nonCadenzaMusic cadenzaMusic)
  (ly:music? ly:music?)
    (let* ((cadenzaLength (ly:music-length cadenzaMusic))
           (nonCadenzaLength (ly:music-length nonCadenzaMusic))
           (factor (ly:moment-div nonCadenzaLength cadenzaLength))
          )
      (ly:music-compress cadenzaMusic factor)
  )
)

% Cadenza
% --------
cadenza = { c''1\fermata b'16[ c'' d'' e'' f'' g''] f''4\fermata e''\fermata }

{
  <<
    \new Staff {
      e''1
      R1\fermata
      e''1
    }

    \new Staff{
      c''1
      \cadenzaToMetre r1 \cadenza
      c''1
    }
  >>
}

% Example ends
% =============

Hope this might help!

Best wishes,

Rupert


> On 31/07/2023 06:19 GMT Valentin Petzel <valentin@petzel.at> wrote:
> 
>  
> Hello Calvin,
> 
> MM rests and cadenzas do not play well together. The reason for this is that 
> the MM is placed centered between start and end of measure. But \cadenzaOn is 
> not really made for creating arbitrary length measures. What is does is 
> simply 
> telling Lilypond to stop counting. So when you do
> 
> \cadenzaOn a \bar "|"
> \cadenzaOff a
> 
> this is technically a single measure (where the cadenza part simply happes 
> before even the first moment). So the MM rest will be centered along the 
> whole 
> thing. (So technically this is a case where MM rests and \bar "|" within a 
> measure do not play together).
> 
> Instead of using a cadanza you might want to use \partial to create a measure 
> of arbitrary length.
> 
> Cheers,
> Valentin
> 
> Am Montag, 31. Juli 2023, 04:17:51 CEST schrieb Calvin Ransom:
> > I have a cadenza where Staff A rests while Staff B plays and after the
> > cadenza Staff A comes back in. In the below minimal example, there is an
> > extra rest added above the note when Staff A comes back in. How do I get
> > rid of this rest? If I use r1 instead of R1 I don't have this issue (but I
> > need to use R1 as my cadenzas are longer than a single measure)
> > 
> > %%%%% SNIPPET BEGINS %%%%%
> > \version "2.24.1"
> > 
> > \new ChoirStaff <<
> >   \new Staff         {
> >     a1
> >     R1
> >     a %why is there a rest above this note?
> >     a
> >   }
> >   \new Staff  {
> >     a1
> >     \break
> >     \cadenzaOn
> >     a
> >     \bar "|"
> >     \break
> >     \cadenzaOff
> >     a
> >     a
> >   }
> > 
> > 
> > %%%%% SNIPPET ENDS %%%%%
> > 
> > Calvin Ransom
> > 
> > Sent from my T530