SM: What was it like to perform for Oprah and our Ultimate Viewers when they were in Sydney?
GS: Oh, it was insane. I mean you got to remember I'm just a little Aussie. But to meet Oprah was unbelievable. ... The Ultimate Viewers were great! They were ready to party. I had the perfect audience. Even though they hadn't heard any of the songs, they were still singing along.
More from Oprah's Ultimate Australian Adventure
Go inside the lavish garden party where Guy performed
Watch Jay-Z surprise Aussie students with a special visit
Go backstage with Russell Crowe