Brandi Carlile, Annie Lennox and Meryl Streep also joined Elton John backing up Joni Mitchell on her "I'm Still Standing" cover.

Almost a decade after suffering from a brain aneurysm, Mitchell has slowly returned to performing Name a better surprise guest at a concert than Sir Elton John. Over the weekend, legendary folk singer Joni Mitchell performed a rare pair of shows at the Hollywood Bowl in Los Angeles.