So who else would do a good job ? have any of the "hired gun" backup singers for famous groups really tripped your trigger ? does it need to be a female ?
Here's one idea........and maybe she has a bigger solo career than I am aware of, but I truly enjoyed Paula Cole backing Peter Gabriel on his secret world tour...GREAT voice !!! ( easy on the eyes too

What about the guy in Light Up, the Styx cover band out of Milwaukee.....he sounds a bit like Dennis, perhaps their voices would blend nicely ? Other ideas ?