By Steve Pond

Many of the songs nominated in the Outstanding Original Music and Lyrics Emmy category occupy key spots in their programs, and “Agatha All Along”’s “The Ballad of the Witches’ Road” appears in eight different versions over the course of its season. But no other contender gets quite the buildup of “Harper and Will Go West,” the sprightly and touching ditty plays at the end of the documentary “Will & Harper.”

The film charts a cross-country trek made by Will Ferrell and his close friend Harper Steele, a former “Saturday Night Live” head writer who recently came out as a trans woman. Early in their journey, they phone their “SNL” pal Kristen Wiig and ask her to write them a theme song that’s a little folky, slightly jazzy, uptempo but not too up, sort of twangy, kind of country and will make you cry.