It was sung by Andrew Duggan, who also narrated and voiced the main character in the show.
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General Electric, the sponsor of the Carousel of Progress, commissioned a new theme song, one to focus more on the here-and-now than on tomorrow, and the Sherman Brothers penned "The Best Time of Your Life.
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1974 also marked the return of the Shermans to Disney to write "The Best Time Of Your Life" which was a replacement song for the General Electric pavilion's "There's A Great Big Beautiful Tomorrow" featured in America Sings at Disneyland and Disneyworld.