They only did one duet, and it actually seems less strange that Bing Crosby only did one duet with David Bowie than it does that Bing Crosby did a duet with David Bowie. Unlikely as the pairing might be, it worked really well. I remember seeing this the first time, and had not seen it since, until now. Hat tip to Ace for that.
Please forgive David Bowie's haircut. It was the '70s.