I know it’s late, but, in case folks weren’t aware of it, The Midnight Special has its own YouTube channel:
The initial 1972 “pilot” (which also doubled as a GOTV effort for that year’s elections) is absolutely loaded, with John Denver hosting and starring him, Cass Elliott, Linda Ronstadt, the Isley Brothers (shortly before the expanded official 3+3 lineup), War, the Everly Brothers, Harry Chapin, Helen Reddy, and more: