Automatically convert beams [ ] into slurs ( ) to indicate melisma (was undefined)

[Paul Morris]

Calixte Faure wrote
> Traditionally, vocal scores are written without beams, except for melisma.
> But modern scores tend to keep beams everywhere and put slurs to indicate
> melisma.
> 
> Is it possible to have both output with one source, without complicating
> the typesetting?
> 
> I have this in mind :
> vocal = \relative c'{
>   c4 d8 e f[ g] a4
> }
> and a magic command (say \beamToSlur) would switch [ ] to ( ).

I've added this \beamsToSlurs snippet to the LSR:
http://lsr.di.unimi.it/LSR/Item?u=1&id=998

I don't think the music example illustrates the use case as well as it
could.  If anyone has a better example, reply with it here and I can replace
the music in the snippet with it.

-Paul




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