sents the position
of the trill in a musical line.</p></dd>


<dt>j</dt>
<dd><p>Optional. A single positive integer, which indicates the end
position of the trill line in a musical line. If not provided, the trill
will appear as a <em>tr</em> symbol above only the trilled note. Otherwise, it
will appear as a <em>tr~~~</em> symbol above the notes between the start and
end positions.</p></dd>


<dt>to</dt>
<dd><p>Optional. A single character or a single positive integer,
which indicates the musical line where