+Jose Lino yes! like in this video, it really is Griffith's voice actor singing! At first I thought it was fake, but having watched the series, I can recognize the characters voices.
I hope he realizes his talent and does covers or something. I know thousands of people who'd love to hear it. Sad that Berserk was his best performance though. I've been looking at his audiobooks and looking to see if he has any official music, haven't found anything notable but goddamn, it would be successful if it existed.