Making it a special treat, though, and well-deserving of being shown here is that it's performed by Angela Lansbury. Though there are a great many people who know of her many Tony Awards for Broadway musicals, this will still be a treat. But for those who only know of her from her dramatic acting as Jessica Fletcher on Murder, She Wrote, this will be gob-smack eye-opening. That's because she not only does a wonderful job singing, but she dances up a storm in a full-blown production number.
When I first watched this, I wondered if Lansbury was touring the country in Mame at the time, since her hair style was what I've seen in all the photos of her in the show. (I'm usually blind to hairstyles, but this was a sort of iconic look.) The show had opened on Broadway in 1966, but I figured she had long-since left the production. I subsequently tracked down that she returned to the show in a tour to San Francisco in April, 1968, which would have been only a month or two after this performance.
One note. At the end of the number, the camera pans the audience and then zooms in on one stoic fellow applauding. That's Sammy Cahn, who wrote the lyrics of the song, which had music by James Van Heusen.