Patsy Cline's life and career were cut short in a plane crash six decades ago. But her musical legacy endures and her influence palpable in a star-packed tribute concert appearing Friday night on PBS.

Loretta Lynn, Dolly Parton, Tammy Wynette, and Patsy Cline harmonized on a song together in 1993. While Lynn, Parton, and Wynette went into the studio to record their parts, Cline had, at that point, ...