Ray Charles Ft. In Ronnie Milsap In Celebration (1983)

According to Billboard of 4 and 18 October 1986, The Nashville Network scheduled a two hour special on 23 and 24 October, titled Ronnie Milsap In Celebration, featuring Ray Charles, Glen Campbell, Gladys Knight & the Pips, Janie Frickie, Leon Russell, Bobby Jones & New Life, and the Whites. This show was originally produced in 1983, and syndicated by Mulimedia [sic?].
Ray and Ronnie dueted on a medley of Your Cheating Heart and Hey, Good Lookin'.
This clip, where we see Gladys and Ronnie singing Tonight I Celebrate, is from the same show.

Medley: