Linda Ronstadt

The Grammy-winning star, 80, explained that she was left unable to "sing a note" after going public with her Parkinson's diagnosis in 2013.

She told AARP magazine: "No one can sing with Parkinson's disease. No matter how hard you try."

The Don't Know Much artist's diagnosis would later be re-evaluated as progressive supranuclear palsy (PSP) – a neurodegenerative condition that shares many symptoms with Parkinson's.