Re: trillSpan question:

[Lukas-Fabian Moser]

Hi Ken,

>    I implemented the trill span; it was not intuitive to me to end the
> trill span on the following note, but it seems to work.

It's possible to add a little bit of syntactic sugar for this construction:

\version "2.22"

trillSpan =
#(define-music-function (mus) (ly:music?)
   #{
     <>\startTrillSpan
     #mus
     <>\stopTrillSpan
   #})

\relative {
  d''2
  \trillSpan e4. d16 e
  \trillSpan { fis4 g gis4. } a8
  a2
}

Lukas