I've kept a 7-inch reel (and AKAI recorder) of tape of the "Good Times Hour", recorded from TV.
"Sing-a-long" notables included Barbra Streisand, Anne Murray, Johnny Cash, Petula Clark, Sonny and Cher, and Linda Ronstadt.
All four seasons are available free from Amazon Prime:
http://www.tv.com/shows/the-glen-cam...hour/episodes/
(The page lists
plenty of familiar names, lost to the past).