Hi Andrew,

Interesting question.
I'm not familiar with Purcell's work but what I found on IMSLP was that
this shake is used as (e.g.) a trill.
So how about :

\version "2.19.45"

purcell-shake-glyph =
\markup\stencil
  #(make-path-stencil
     '(M -0.20  0.05 L  1.55  0.51 M -0.31  0.43 L  1.45  0.90)
     0.17 1 1 #f)

shake =
#(define-event-function () ()
   #{
     -\tweak stencil #(lambda (grob)(grob-interpret-markup grob
purcell-shake-glyph))
     \trill #})

%% Test:
{
  a'\shake
}

Cheers,
Pierre


2016-07-19 2:34 GMT+02:00 Andrew Bernard <andrew.bern...@gmail.com>:

> Hi Pierre,
>
> Wouldn’t it be better to do these are actual ornaments instead of just
> markup? I say this because there is a page on the lilyond blog regarding
> this, but it is only partially complete. If we did them as ornaments the
> possibility would arise of being able to use them to set English Virginal
> Music which uses the slash and double slash, through the stem, extensively
> - although as folks have noted, nobody really knows what they mean.
>
> Since I am a harpsichord player I am one day going to do all the many
> varieties of the French keyboard ornaments, a rich and flowering garden, so
> I  have just now taken an interest in this thread.
>
> Andrew
>
>
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