Re: irrational meters

[Karim Haddad]

Thank you again Leo,

This comes very handy.

BEst
K


On Wed, Jan 18, 2023 at 11:14:39AM +0100, Leo Correia de Verdier wrote:
> If the warnings bother you you could use a function to suppress them, like:
> 
> irrtime = #(define-music-function (frac) (pair?) 
>              #{ #(ly:expect-warning "strange time signature found") 
>                 \time #frac #} )
> 
> \score { 
>   \relative c' {
>     \irrtime 4/5
>     \tuplet 5/4 1 {
>       c4 d e f |
>       g a2 g4 | 
>       f2 g |
>       e4 f e d |
>       c1 | }
> }}
> 
> Or  something more elegantly coded…
> 
> And everyone else: Can we talk about breve? It is nowadays usually one of the 
> longest durations. I think we should change its name! 😉 (or possibly keep on 
> topic)
> 
> Best wishes
> /Leo
> 
> > 17 jan. 2023 kl. 16:13 skrev Karim Haddad <karim.haddad@ircam.fr>:
> > 
> > Thank you a lot Leo for your advice.
> > I'll hence stick with solution #1 which looks preferable.
> > 
> > @all
> > Now about "irrational meter" (or "irrational" rhythms), well this 
> > denomination is from the fifties. I am aware that mathematically this is 
> > not correct since it is a fraction.However, "irregular" is somehow more 
> > vague and doesn't relate to anything in particular. Thanks to Hans' link 
> > that shows that it is a somehow a common terminology in music practice. 
> > 
> > Best to all of you, and thank you for all your comments.
> > 
> > Karim
> > 
> > 
> > 
> > On Tue, Jan 17, 2023 at 01:30:49PM +0100, Leo Correia de Verdier wrote:
> >> Hi Karim!
> >> 
> >> Your first example seems to work to me (I don’t do irrational meters 
> >> everyday, so there might be something I’m missing. I would probably write 
> >> the tuplets explicitly rather than use \scaleDurations). 
> >> \set Staff.timeSignatureFraction is superfluous, the time signature 
> >> already does that.
> >> 
> >> I’m not sure what you’re aiming at with the second example. One source of 
> >> error is that you have quoted ly:make-moment, and it wants its arguments 
> >> as elements of a list, not as a fraction, so: 
> >> #(ly:make-moment 16 25)
> >> , not
> >> #'(ly:make-moment 16/25)
> >> But it is still not the right amount of notes in the bar.
> >> 
> >> HTH
> >> /Leo
> >> 
> >>> 17 jan. 2023 kl. 12:16 skrev Karim Haddad <karim.haddad@ircam.fr>:
> >>> 
> >>> Hi,
> >>> 
> >>> I am wondering which is the best way to write irrational meters (with 
> >>> tempo modulations)
> >>> 
> >>> 1)
> >>> %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
> >>> \version "2.24.0"
> >>> \score {
> >>> {
> >>> 
> >>> \clef "G"
> >>> 
> >>> \scaleDurations 4/5 {
> >>> \time 4/5
> >>> \set Staff.timeSignatureFraction = #'(4 . 5)
> >>> \mark \markup {\left-column {{\line { \smaller \general-align #Y #DOWN  
> >>> \note {4} #1 " = 60 "}} \tiny "1"}}
> >>> c'4
> >>> c'4
> >>> c'4
> >>> c'4
> >>> |
> >>> }
> >>> \once \set Staff.whichBar = "|"
> >>> }
> >>> 
> >>> 
> >>> \layout {
> >>> 
> >>> \context {\Score
> >>>    %    measureBarType=#""
> >>>             }
> >>> 
> >>> }
> >>> }
> >>> %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
> >>> 
> >>> or
> >>> 
> >>> 2)
> >>> 
> >>> %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
> >>> \version "2.24.0"
> >>> \score {
> >>> {
> >>> \clef "G"
> >>> 
> >>> \time 4/5
> >>> \set Staff.timeSignatureFraction = #'(4 . 5)
> >>> \set Timing.measureLength = #'(ly:make-moment 16/25)
> >>> \mark \markup {\left-column {{\line { \smaller \general-align #Y #DOWN  
> >>> \note {4} #1 " = 60 "}} \tiny "1"}}
> >>> c'4
> >>> c'4
> >>> c'4
> >>> c'4
> >>> |
> >>> \once \set Staff.whichBar = "|"
> >>> }
> >>> 
> >>> \layout {
> >>> 
> >>> \context {\Score
> >>>        measureBarType=#""
> >>>             }
> >>> 
> >>> }
> >>> }
> >>> %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
> >>> 
> >>> 
> >>> Now the first solution outputs:
> >>> 
> >>> Processing `irr1.ly'
> >>> Parsing...
> >>> Interpreting music...
> >>> irr1.ly:13:1: warning: strange time signature found: 4/5
> >>> 
> >>> \time 4/5
> >>> Preprocessing graphical objects...
> >>> 
> >>> 
> >>> Which looks good to me as a warning
> >>> 
> >>> However, the second solution gives:
> >>> 
> >>> Processing `irr2.ly'
> >>> Parsing...
> >>> Interpreting music...
> >>> warning: type check for `measureLength' failed; value `(ly:make-moment 
> >>> 16/25)' must be of type `moment'
> >>> irr2.ly:12:1: warning: strange time signature found: 4/5
> >>> 
> >>> \time 4/5
> >>> irr2.ly:20:1: warning: barcheck failed at: 1/5
> >>> 
> >>> |
> >>> Preprocessing graphical objects...
> >>> 
> >>> 
> >>> And if we comment measureBarType=#"" we will have a strange bar at the 
> >>> end.
> >>> 
> >>> 
> >>> Best Regards
> >>> 
> >>> 
> >>> -- 
> >>> Karim Haddad
> >>> 
> >>> Music Representations Team, IRCAM
> >>> Research and development manager.
> >>> 
> >>> 
> >> 
> > 
> > -- 
> > Karim Haddad
> > 
> > Music Representations Team, IRCAM
> > Research and development manager.
> > 
> 

-- 
Karim Haddad

Music Representations Team, IRCAM
Research and development manager.
email   : karim.haddad@ircam.fr
webpage : http://karim.haddad.free.fr