The catchy, folk-tinged numbers from “Treason the Musical” have been streamed online over a million times, in 96 countries. Its fans — known as “Plotters” — have been listening to an EP, an acoustic record and a live album of the songs, as well as sharing their own performances on TikTok. Unlike “Beetlejuice,” “Heathers” or “Dear Evan Hansen,” which all parlayed onstage popularity into huge digital followings, “Treason” is turning the formula for musical success around. Its producers cultivated an online fandom for three years before raising the curtain on the show, and are now banking on those fans buying theater tickets, too. “Treason” is currently on a 27-show tour of Britain that culminates in two performances at London’s largest theater, the 2,286-seater Palladium, on Nov. 21-22.

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Persons: ”, “, Evan Hansen, Ricky Allan, King James I, — Locations: Britain, London