During the tracking for "A Prelude To Sorrow" Joseph Michael went to Visit Mixing Engineer/Producer Michael Wagener (Metallica,Skid Row) and recorded some vocals at his studio in Nashville.
Here is a short video of the meeting:
https://www.youtube.com/watch?v=Oo9trCpvZPU
you can hear his recording work on the Witherfall version of Tom Petty's I Won't Back Down. Watch here: