On set in L.A. as the PYTs of music get ready to play Pink Ladies, the director of 'Hamilton' lends cool and Fox diversifies (natch) and modernizes the original high school musical, set to go live Jan. 31 on TV.

"This is serious business," says Carly Rae Jepsen, wide-eyed at the dozens of carpenters and gaffers hammering, sawing and wiring the massive high school gymnasium still under construction at Warner Bros. Studios. "I have to get my Hula-Hoop!"

It's the first day of school at Rydell High -- or, rather, the first day of on-set rehearsals for the young stars of Fox's TV musical Grease: Live, which on this dreary December day is only six weeks away, with a 7 p.m. ET air date on Sunday, Jan. 31.

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