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If you’re going to musicalize a horror movie, “Teeth” is a doozy, and a gamble.

The expectation of how Elton John and lyricist Shaina Taub, composer of off-Broadway’s recent “Suffs,” would musicalize the toxicity of Miranda’s Vogue-like Runway magazine turned Sunday night at the Nederlander into a rare convention of national critics.

More than 30 years into a convention-shattering career, Sondheim still raised eyebrows when he announced he was about to musicalize the likes of John Hinckley Jr. and John Wilkes Booth.

Schwartz had just four weeks between the transfer from La MaMa Experimental Theatre Club to the Cherry Lane Theatre to write new music to eight existing songs, write five additional songs and musicalize the prologue.

For “Ragtime,” he had written a 60-page treatment of how you might musicalize the novel for the stage.