Avantasia mastermind Tobias Sammet (Edguy) has checked in with the following update:

"Dee Snider, Geoff Tate, Bob Catley, Michael Kiske, Olli Hartmann, Ronnie Atkins and Jorn Lande… and I want to announce another guest for the new album. Please welcome - from Phoenix, Arizona - former Lynch Mob singer and current vocalist of US platinum rockers Warrant: Mr. Robert Mason!

This man must have one of the bluesiest, raspiest and cutting voices I‘ve ever heard. I found it really exciting to approach Robert to sing on Avantasia, a bluesy voice doing some Classic European 'Wagnerian Rock' material. What I knew would be an explosive combination has turned out to be way more than I could have hoped for. He did a hell of a job, and I am sure you will love it. Great voice, Mr. Mason!

Here's a Lynch Mob video featuring Robert from back in the day...