Two years after taking his final bow on the tour stage and 55 years since his debut in Los Angeles, “IMPACT x Nightline” looks back at the career and life of Elton John. “Good Morning America” co-anchor Robin Roberts sits down exclusively with the iconic singer to talk about the start of his career, as well as some of the highest moments and greatest challenges he faced along the way, including his battle with addiction, abusive childhood and struggles with loneliness. Additionally, David Furnish joins the conversation with his husband, Elton, to discuss their marriage and their lives as fathers to their two children. The new episode also explores the impact Elton has had on a younger generation of artists, including Lady Gaga, Charlie Puth and Brandi Carlile, who share what it is like working with the legendary musician.