LAS VEGAS -- An 81-year-old jazz giant and a 15-year-old rock singer were the first to perform tributes to Joni Mitchell on Friday night.Such was the diversity of artists honoring a most diverse artist, Mitchell, a Canadian-turned-Californian, folkie-turned-rocker-turned-jazz explorer who was honored as the 2022 MusiCares Person of the year by the Recording Academy two days before the Grammy Awards.Herbie Hancock played a jazz piano rendition of music from Mitchell's 1976 album “Hejira” that was followed by a rocking version of 1974's “Help Me” from Violet Grohl, the teenage daughter of Foo Fighters frontman Dave Grohl, to open the tribute concert in a ballroom at the MGM Grand Las Vegas.Mitchell, sitting at the front table, brought out the teenager in many of the older entertainers.“When I first heard Joni Mitchell it was 1968 and I was 15 years old,” Cyndi Lauper, now 68, said. “I had never heard anyone sing so intimately about what it was like to be a young woman navigating this world.”Lauper recited several of Mitchell's lines that moved her most, before launching into “Magdalene Laundry” while playing mountain dulcimer.“I don’t know how you do what you do, I just know I need it like food,” Meryl Streep said in a video message played for Mitchell and the crowd.