Back in 1972 when Sesame Street began its fourth season, I've noticed that the show started producing segments on-location with videotape. It's more common (and cheaper) to produce segments outside of the TV studio on film, but I found it interesting that Sesame Street seemed ahead at the time by using videotape on certain scenes. While we already know that the opening montage to accompany the show's theme song was on videotape starting in season four, as well as a News Flash segment involving Kermit the Frog asking a young girl about the sounds certain animals make (from the fifth season premiere show, although I'm pretty sure that there were more "on the street" news segments produced), there were also some other videotaped segments on the show, that may not have been used much beyond the mid-70s, focusing on letters of the alphabet. One that comes to mind is from the fourth season premiere episode showing the lowercase letters from A to Z one at a time surrounded by multi-colored computer-generated squares and diamonds floating around as a male voice-over recites each letter. There was also a similar segment like this with the numbers 1 to 20 being counted by a female voice as the numbers appear over what looked like a blurry image of a mirror ball slowly rotating as some rather "haunting" soundtrack of bells and chimes play. The segments showcasing a different letter of the alphabet were ones that showed a footage of something in an outdoor location with a computer-generated capital letter, that stood for the featured object(s) seen on-location, moving around the screen. A male voice-over (same one from the alphabet segment previously mentioned) would say the name of the letter and whatever it stands for. One example I know is for the letter Y. Three capital Ys are "balanced" on three individual yachts in tow at a dock during sunrise. The segment is provided with a soundtrack of music by Joe Raposo (who also did the music in the alphabet and numbers segments) that sounds like a sailor's theme to set the mood. Would anyone happen to know if there were ANY other segments produced for the show around this time? I wonder if there were any more "letters on-location" segments produced for, if not all, almost every letter of the alphabet.