Watching this stuff about David Ruffin and found what is said @ 9:20 interesting:
https://www.youtube.com/watch?v=HZ8pYs0Yovo
here's the performance:
https://www.youtube.com/watch?v=lXrP3wFfBrM
Hee Haw! At the end Diana has given up and is taking her bows and David is still singing!