Stephen Gray
... that six conductors took part in the retirement concert for Stephen Gray, including Simon Rattle, whose career Gray promoted?
... that six conductors took part in the retirement concert for <b id="mwtg"><a href="./Stephen_Gray_(musical_administrator)" id="mwtw" rel="mw:WikiLink" title="Stephen Gray (musical administrator)">Stephen Gray</a></b>, including <a href="./Simon_Rattle" id="mwuA" rel="mw:WikiLink" title="Simon Rattle">Simon Rattle</a>, whose career Gray promoted?