Some subtle Disney shirts are for people who've been on a ride once. This one is for people who can hum the whole song. Walt Disney's Carousel of Progress is the longest-running stage show in Disney history — it debuted at the 1964 World's Fair, drew 16 million visitors, moved to Disneyland, then to Magic Kingdom in 1975, and it is still running. Walt himself called it his favorite attraction. In Act One, set in the 1890s, Father mentions he loves taking the horseless trolley downtown for a root beer — which, he explains, is just a sarsaparilla with a new name. The Sherman Brothers who wrote the theme song said "There's a Great Big Beautiful Tomorrow" was really Walt's theme song. They weren't wrong. Comfort Colors 1717, soft and slightly oversized. The song is already in your head.