Lionel Richie has been touring for much of the summer. During his San Francisco show on Friday, Sept. 8, at the Chase Center, while performing his dozens of hit songs, one song came up and it got real, “Endless Love.” Richie and Diana Ross recorded the song in 1981, and it was used on the soundtrack for Franco Zeffirelli film of the same name. The track was the second biggest-selling song on Billboard’s singles chart for the year. And according to a playful rant during his show, Ross refuses to perform it with him. Richie told the crowd, “[For] 37 years, Diana said ‘No [to singing the song].’ What made you think tonight she was going to show up? She ain’t coming.” “She’s over there singing ‘Happy Birthday’ to Beyoncé,” he joked, before adding, “Pissed me off.” Why do you think that Diana Ross refused to sing the duet live?