quotedEventTypes property determines the
music event types which should be quoted. The default value is
(note-event rest-event tie-event beam-event tuplet-span-event), which means
that only the notes, rests, ties, beams and tuplets of the quoted voice will appear
in the \quoteDuring expression.
In the following example, a 16th rest is not quoted
since rest-event is not in quotedEventTypes.
For a list of event types, consult the Music classes
section of the Internals Reference.