\cueWhile takes four arguments: the music from which the cue
is to be taken, as defined by \addQuote, the name to be
inserted before the cue notes, then either #UP or #DOWN
to specify either \voiceOne with the name above the staff or
\voiceTwo with the name below the staff, and finally the piano
music in parallel with which the cue notes are to appear. The name
of the cued instrument is positioned to the left of the cued notes.
Many passages can be cued, but they cannot overlap each other in time.