The Roots of American Music Festival at Lincoln Center Out of Doors concluded Sunday Evening with a far-flung tribute to Soul in all its eras: legendary singer Swamp Dogg, new-soul singer Aloe Blacc, and an all-star tribute to poet/singer Gil Scott-Heron (with performances by Last Poet Abiodun Oyewole, Sandra St. Vincent, Martha Redbone, and GSH cohort Brian Jackson). What a way to end this year's festival!