Joni Mitchell was honored in Washington D.C., presented with the Library of Congress Gershwin Prize for Popular Song, and celebrated by her peers and famous fans, including Cyndi Lauper, James Taylor, Marcus Mumford and Brandi Carlile. Walking the red carpet with a cane, the Canadian singer-songwriter said that the honor was "very exciting." After an evening of performances in her honor, Mitchell, 79, took the stage and paid homage to the Gershwin Prize's namesake, George Gershwin, performing "Summertime" from "Porgy and Bess." Performers Graham Nash, Ledisi, Herbie Hancock, as well as Lauper, Taylor, Mumford and Carlile later joined Mitchell on stage to perform her hit song "Circle Game," bringing the crowd to their feet.