The crooner, 81, is currently on a European tour after recently recording a new album.
He needs an autocue in case he forgets the lyrics to his songs and works with a small band on stage, who can support him and spot if he is ever struggling.
Tony said: "It's amazing, the dementia doesn't seem to have affected performance at all.
"My voice is still there. Some people who have been watching me for years even say I sound better than ever.
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