Not brave - everyone there has paid a lot of money because they love him and they are in a great mood, prepared to enjoy themselves. They are not going to give him a hard time.
He is just doing something he has done many, many times before.
I saw him live at the Royal Albert Hall a few years ago. I don't know if that's the show you were watching. Absolutely stupendous! A man of genuine talent. He is a STAR in the real sense of the word! Just fabulous.
I saw Neil Sedaka in Cardiff quite a few years ago. I really like him, he is excellent. I noticed that most of the audience knew every word of every song, and were singing along with him Lovely