Sirius Satellite Radio:  quot;Broadway: The American Musical quot; Director &lt;b&gt;...&lt;/b&gt; Special guest Oct. 11-24 on  quot;Radio Playbill quot; is Michael Kantor, who has spent much of the last decade on an epic project, the six-part TV miniseries,  quot;Broadway: The American Musical, quot; debuting Oct. 19-21 on PBS.