"Hello everyone, specifically everyone in Phoenix, Arizona. I can't do my show tonight, my second show here. I'm really, really sorry.
"I've had a cold for a couple of days and I've been pushing through it, and I did my show last night and I loved it - but I pushed too hard, and my cold has got the better of me.As you can hear, even if I did the show, it wouldn't be very good. I'm really, really, really, really sorry to let anyone down.I've enjoyed my tour so much and cancelling shows has not been something that I want to do.
"I've pushed through a lot, but I've been trying to sing all morning and warming up, but nothing's really happening.I'm so sorry to let you down, I know lots of people will be flying in from all over, it's the last thing I want to do, but I have to look after myself."
Here's the a screenshot from the video: