Paul Simon made his Newport Folk Festival debut with a surprise appearance during Nathaniel Rateliff’s “American Tune Revue” set on Saturday. Rateliff and his band the Night Sweats dedicated their entire show to Simon, covering a bunch of his songs before Simon himself came out to sing “Graceland,” “American Tune,” “The Boxer,” and “Sounds Of Silence.” He was joined by Rhiannon Giddens on “American Tune,” and a whole bunch of performers came out for “The Boxer.” “What a joy working with Nathaniel and his incredible band. The atmosphere at the festival was nothing short of wonderful,” Simon said.