I don’t know about Deniece but I saw recently that Johnny was performing, at 87! World class singer.
Long ago, and once a few years ago, I played for this guy who is considered a world class singer. Here he is on his recent 74th birthday, being introduced by Ray Stevens, of all people.
https://www.youtube.com/watch?v=0YQpV5o6Wgw
thanks, sweet song