.... in his Big Broadcast program, at least a dozen years ago. I am a fan of "The Rifleman" with Chuck Connors and Johnny Crawford as a his son. I record most of the Big Broadcast programs and listen to the recording at a later time; as I listen to the recording, I keep portions of special interest. I may have kept that part of the program where Johnny was a guest. I'll look for it.
Indeed, Johnny Crawford turned out to have a very pleasant voice and had a good feeling for Crosby's singing style of the 1920s.Here is Johnny's website. http://www.crawfordmusic.com/
Let us not forget that the magnificent Berman documentary "Bix, Ain't None of Them Play Like Him Yet" was released by Playboy Jazz!!