What musical duo wrote a song for the opening-day ceremony at EPCOT entitled "The World Showcase March"?

The EPCOT theme park opened on October 1, 1982, and as part of the opening-day ceremony, The Sherman Brothers wrote a song entitled "The World Showcase March". During the grand finale, countless balloons were released into the sky.

Asked by Rachel Bortles · Last updated 5 years ago · 11.5K views · SOURCE