Jon had Katie Agresta with him in 2008 and we saw good things come out of that.
He didn't seem to be working with any particular vocal coach in 2013, but if I recall correctly, he started requesting one in each city as part of his rider on the BWC tour, so presumably he knew things were going wrong then.
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Subiaco Oval, Perth - 25 January 2008
Patersons Stadium, Perth - 8 December 2010
Etihad Stadium, Melbourne - 7 December 2013
Etihad Stadium, Melbourne - 8 December 2013
Perth Arena, Perth - 12 December 2013
Arena Joondalup, Perth (Soundwave) - 3 March 2014
ANZ Stadium, Sydney - 8 December 2018
 Blame It On The Love...
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