She couldn't walk, she couldn't talk': music therapy helped Joni Mitchell recover from a stroke could it ward off depression and dementia too?

"If you're talking about therapeutic effects, you have to like the music. If you don't like it, your walls are going to go up, your cortisol levels will spike."

"As luck would have it, Mitchell had set down exactly what she'd need in these circumstances while she was well, and Levitin knew precisely where the nurses could find it."

Read at www.theguardian.com