What Epcot attraction used the same theme song as an attraction replaced in Disneyland by America Sings in 1974?
There's a Great Big Beautiful Tomorrow: "There's a Great Big Beautiful Tomorrow" is the theme song to two Disney attractions, Walt Disney's Carousel of Progress at the Magic Kingdom of Walt Disney World (formerly at Disneyland) and Innoventions at Disneyland. There's a Great Big Beautiful Tomorrow:  It was also used in one scene of the Epcot attraction Horizons. Walt Disney's Carousel of Progress:  It was replaced in Disneyland by America Sings in 1974, and reopened in its present home in Walt Disney World Resort's Magic Kingdom in 1975.
Horizons