
Joni Mitchell fans, get your tissues ready. On tonight's PBS special, Joni Mitchell: The Library of Congress Gershwin Prize for Popular Song, her contemporaries such as James Taylor and Herbie Hancock and fans such as Brandi Carlile and Diana Krall pay tribute to the legendary singer-songwriter with interpretations of some of her classics.
Among them: Marcus Mumford performs "Carey," Herbie Hancock and Ledisi perform "River" and Angélique Kidjo sings "Help Me."