PLOT
Singer and songwriter Willie Nelson was the 2015 recipient of the Library of Congress Gershwin Prize for Popular Song. The all-star tribute featured performances by Nelson, as well as Edie Brickell, Leon Bridges, Rosanne Cash, Ana Gabriel, Jamey Johnson, Alison Krauss, Raul Malo of The Mavericks, Neil Young, Promise of the Real, Buckwheat Zydeco and past Gershwin Prize honoree Paul Simon