> First off, is there a better way to do this?


Yes. See 
[https://lilypond.org/doc/v2.24/Documentation/notation/displaying-rhythms.html#polymetric-notation](https://lilypond.org/doc/v2.24/Documentation/notation/displaying-rhythms.html#polymetric-notation)



> It gets worse.  There is a section where both hands are in common time, but 
> even though the right hand time signature isn't changing, it needs to be 
> displayed again.  Again, my tactic would be to fake the time changes.  
> However, there is a break in the piece that has one time signature before the 
> break and a different one after.  What I should really do is have a change 
> time signature after the bar but before the break.  I don't know how to 
> "fake" that.

Adapting the example from the documentation:

```
\version "2.24.2"

\layout { \enablePolymeter }

\relative <<
  \new Staff {
    \time 3/4
    c'4 c c |
    c4 c c |
    \break
    c2.
  }
  \new Staff {
    \time 3/4
    \set Staff.timeSignatureFraction = 9/8
    \scaleDurations 2/3 {
      \repeat unfold 3 { c8[ c c] }
      \repeat unfold 3 { c4 c8 }
    }
    \unset Staff.timeSignatureFraction
    \time 3/4
    c2.
  }
>>
```


Best,

Jean

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