Napa CA -- Glenn Campbell has sold 50-million records in his career.
Now at 76 years old, he will play his final concert Friday night in Napa California.
Campbell was diagnosed with Alzheimer's disease two years ago. With the support of his children he has been able to continue touring.
"I feel a little protective of him you know? I just wanna make sure he's - if he needs anything from me, I'm there, and I'm paying attention, you know. I think it helps when I just smile at him. He looks at me a lot and I just smile at him. And he looks back at the audience with a little more confidence I think. When I'm watching him on stage, I'm also just watching in amazement, you know," says Campbell's daughter Ashley.