It really was Cammie:
Next clue:
This must be Mike Mills.
Next clue:
This must be Mike Mills.
It was him.
This is supposedly someone called Paul Manzi from a band called Arena.
And this is the latest clue, probably Dianne van Giersbergen:
She's so awesome. Even her completely ridiculous way of talking is awesome.
I have no idea who this is, but people are saying it's Johanne James, Threshold drummer and singer/drummer for Kyrbgrinder.