I just saw the video for that show you mentioned. Yes, it's 'that' Keith Mansfield. His works also appear in several NFL Films documentaries, to name a few.Regarding the "Beginning/End" segment, it appears that the guy who recorded the music for that segment was the same guy who recorded the instrumental song that was used on the pilot episode of the game show Press Your Luck.
Welcome to the Muppet Central Forum!
Christmas Music
Macy's Thanksgiving Parade
Sesame Street debuts on Netflix
Back to the Rock Season 2
Sam and Friends Book
Jim Henson Idea Man
Bear arrives on Disney+