NEW YORK — The magnificent wall of sound in the full-company opening number of “Ragtime” is a patriotic metaphor. America’s promise has always rested on uneasy accord among people — in this case, a mix of White, Black and immigrant New Yorkers around 1906 — that threatens at any moment to explode. Harmony is rare enough lately that even in song it can feel like deliverance. Subscribe for unlimited access to The Post Save on unmatched reporting. Get your first year for $20

When a stripped-down version of this revival played a two-week off-Broadway run last November, performances fell on both sides of the presidential election. Given the musical’s central themes about how race, class and immigration shape the pursuit of the American Dream, the atmosphere was electric, even with a mostly

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