Last night, Joni Mitchell was the guest of honor at MusiCares’ Person Of The Year gala, which took place at the Marquee Ballroom in Las Vegas prior to Sunday’s Grammy Awards. Mitchell, who is 78, also sang onstage for the first time in nine years, and Brandi Carlile, Beck, John Legend, Mickey Guyton, and more artists performed covers of her songs over the course of the evening.