Dolly Parton’s 1976 syndicated variety series Dolly gave fans a first glimpse of a collaboration that would later become legendary. Joined by Linda Ronstadt and Emmylou Harris, she delivered a moving performance of “The Sweetest Gift,” a gospel ballad written by James B. Coats in 1942. With Harris on acoustic guitar and the three weaving exquisite harmonies, the song became the emotional high point of the series and a preview of the celebrated Trio recordings released more than a decade later. L