Joni Mitchell made a rare appearance at the Grammys on Sunday evening, performing “Both Sides, Now.” Accompanied by Brandi Carlile, Lucius, Allison Russell and others, it marked Mitchell’s first time playing the lauded industry event. She is now a 10-time Grammy winner, having won this year’s award for Best Folk Album with Joni Mitchell at Newport. “She redefined the very purpose of a song to reflect the contents of a person’s soul,” Carlile said before the performance, describing Mitchell as “the matriarch of imagination.” Prior to this year’s show, Mitchell’s most recent Grammy win occurred …