This was posted on Linda Lavin's YouTube channel. Not sure of the year. I love it. :D
(It's not working when I try to make it as a YouTube post)

https://www.youtube.com/watch?v=ENG-Wng11CY

According to Google's AI, it aired on April 22, 1977. Sadly everyone on stage is gone now.

Polly Holliday was a piano teacher before she became an actress.

Dinah Shore guest starred as herself in the episode "Mel's in the Kitchen with Dinah" on November 18, 1979.

Video description:

Linda Lavin and the Cast of Alice Singing on a Talk Show! With Polly Holiday, Beth Howland, Vic Tayback, and Phillip McKeon.

Linda Lavin and the Cast of Alice Singing on a Talk Show! (https://www.youtube.com/watch?v=ENG-Wng11CY)

ENG-Wng11CY

Really cool! The kind of thing that could easily have been lost video.