WASHINGTON, United States---Artists spanning the genres came together Wednesday, March 1, to celebrate the peerless Joni Mitchell, honoring her vast contributions to popular song. The pioneering singer-songwriter behind poignant hits including "A Case of You," joins an elite coterie of composers including Stevie Wonder, Paul McCartney, Tony Bennett and Carole King in receiving the US Library of Congress' Gershwin Prize, which is named for the brothers behind American standards such as "I Got Rhythm" and "Rhapsody in Blue." Not one but two of her muses---James Taylor and Graham Nash---performed; both were among the lovers and collaborators she counted throughout her storied care...Keep on reading: Singer-songwriter Joni Mitchell honored at star-studded concert gala