irrational meters

[Karim Haddad]

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.