One thing worth discussing is that I use the verb "to cue"
differently from the original author.
I believe that to cue is to *give* a signal for someone else to
begin action. So the instrument playing just before the singer
begins is the cue-ing instrument (or the quoted instrument) and
the singer is cued. Similarly, the notes are 'cue notes', which
we might have hyphenated fifty years ago, rather than 'cued
notes'.
Suggestions attached as a diff,
except that the cueWhile function is in a snippet, not the .itely,
so the corresponding change is below :
cueWhile =
#(define-music-function
(parser location instrument name dir music)
(string? string? ly:dir? ly:music?)
#{
\cueDuring $instrument #$dir {
\once \override TextScript #'self-alignment-X = #RIGHT
\once \override TextScript #'direction = $dir
s1*0-\markup { \tiny $name }
$music
}
#}
)