Glen Campbell
Glen Campbell 1936 - 2017
Bob Hope special (April 1972) 
From April 1972, Glen Campbell sings the Badfinger/Harry Nilsson hit "Without You". He even recorded the backup vocals for this performance. If he did record this song during this era, he never released it, which makes this performance even more special.

Juice Newton & Glen Campbell (1995) 

 Juice Newton duet with Glen Campbell - Without You (1995)