To show how skillful her improvisation is, Susanna gave Mr. Harvey some random notes and asked if he could use them to create a piece of music.
As Susanna and Piers spoke to the former teacher live from his home in East Sussex, he duly made a commitment and provided an unlikely emotional end to the show.
“If we give you C, D, G, and B?” Susanna said via a video link.
Mr. Harvey then played each of the notes in turn before immersing himself in a stunning flawless piece of music.
The camera then returned to Susanna and Piers at the ITV studio as they watched speechless.
“Do you know what we don’t need to say, play us against Paul. Play us against Lorraine, ”Piers urged when he finally broke his silence.
As Mr. Harvey put an end to the piece he had just composed, the Good Morning Britain crew erupted to applause.
Viewers watching at home were also overwhelmed and responded on Twitter to say that his performance elicited “tears and cheers” in their homes.
“A real joy to see. It filled my heart and that of my son with joy. He left school with a bad cold today and I’m recovering from cancer treatment. A talent like this amazes me. Thanks GMB. Xx ”said one.
“Handsome man, beautiful music and a really special soul,” agreed another.
“I brought tears to my eyes. How amazing is the power of music? asked a third.
Mr Harvey found unexpected fame when his son Nick shared a video on Twitter of his dad, who has dementia, playing a piece of piano music he wrote more than 30 years ago.
He wrote music in the 1980s, while working as a music and theater director at a local school.
While Paul lives with dementia, he is able to remember music and easily compose new material.
Sharing one of the videos on his social media, his son Nick wrote: “Dad’s ability to improvise and compose beautiful melodies on the fly has always amazed me.
“Tonight I gave him four random notes as a starting point. Although his dementia is getting worse, times like this bring him back to me.