>> I wonder whether it makes sense to provide this behaviour as the
>> default for lilypond. Or to ask differently: Is there any practical
>> use of having redundant calls to \time or \key actually print a time
>> or key signature again?
>
> 1. The way the current "multi-instrumentalist" mechanism(s) in
> Lilypond work (or don't), I often find I need to call a redundant
> \key, in order to explictly generate the [new] key signature
> after an instrument switch.
OK.
> 2. In my polymetric works, it has been suggested [by conductors and
> performers of my works] that I:
> (a) repeat the time signature — possibly in parentheses — at the
> beginning of new systems where different staves are [still]
> in different time signatures; and/or
> (b) restate (in parentheses) the unchanged time signature in one
> staff when another staff has a time signature change.
This is a completely different issue. You want exactly the opposite,
namely to control whether time signatures are displayed at the
beginning of a line (or whereever) inspite of not having an explicit
\time command.
> It would be wonderful if there were a switch I could use that could
> make this possible as a tweak (or whatever).
I suggest to file a feature request :-)
Werner
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