Awesome reaction mate. The singer Yannis Papadopoulos is ridiculously talented especially on the falsetto / head voice range. Check out their song "From hell with Love" or "Moonlight Rendevouz" if you wanna dig more into their music. I would also recommend checking Yannis' cover of "Ghost Live Score", but I'm not sure if you have heard the original. If not, then DEFINITELY check Nightwish - Ghost Love Score first (Wacken 2013 live version is the bomb).
"That dude. He could make some R'n'B shit. He could sing a chick right outta them drawers." Your comments always crack me up.. :D I actually thought it was a woman singing when I first heard this song on the car radio. I was very surprised when I later saw the video!
You should try his (Yannis Papadopoulos) version of Ghost Love Score and then follow it up with the original version (Wacken Live) from Nightwish. He sang it in the SAME KEY💯
They are actually baised on a dark fantasy manga series called Berserk. And most of their songs are based on said manga as well as a select few other manga series such as fist of the north star.