Few musicians have had as lasting an impact on music as Joni Mitchell. In her four-decade career, she made groundbreaking music that traversed genres and continually stunned fans and critics alike. The music icon celebrated her 75th birthday in style last November, as Jörn Weisbrodt and The Music Center in Los Angeles hosted a pair of star-studded Joni 75: A Birthday Celebration concerts in her honor. The line-up (which Joni helped select) featured many of her closest friends and dearest