Las Vegas (AFP) – Music’s legends and hitmakers turned out Friday to honor Joni Mitchell — the Canadian-born folk icon behind classics including “A Case Of You” — at a charity gala ahead of the Grammys that featured moving tributes and glassy eyes. The 78-year-old Mitchell donned a sequined kimono-style robe, bejeweled black beret and bright red nails at the MusiCares show where artists including Herbie Hancock, Cyndi Lauper, Angelique Kidjo and Stephen Stills, along with this year’s leading Grammy nominee Jon Batiste, paid homage to her vast oeuvre. “It’s been quite a year,” the artist know…