He tells WRKR-FM: "Our stage production is two stories and I'm up and down those stairs several times throughout the set. It's not easy when you sing my style of vocals.

"I get much less oxygen than the rest of the band as I take a deep breath and let it out slowly while I'm controlling the outflow. I can sing song lines and keep talking, so it's a lot less oxygen into the blood. I really have to economise what's going on.