Here are some various digitally re-assembled backgrounds from the color opening of THE MICKEY MOUSE CLUB!
Mickey was dressed as a bandleader, marching in front of this grouped character B/G. You never saw the complete B/G... until today!
Looks like a Fleischer Superman B/G! Nope, MMC!
This abstract B/G is very attractive with its pink and blue color palette.
This B/G obviously reflects the Hollywood Bowl design: