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Glen Campbell wanted to "make a difference in the world" says James Keach, producer of the 2014 documentary, 'Glen Campbell: I'll Be Me"

The documentary centres on the Rhinestone Cowboy singer's Alzheimers diagnosis and his final live tour.

"He would lift people's spirits each time he came on the stage", said Keach.

"Instead of booing when he would forget the words, they would finish the song for him."

Glen Campbell has died at the age of 81 after "a long and courageous battle" with Alzheimer's disease, his family said.

This clip is originally from Up All Night Tuesday 8 August 2017.