The original score works by aggregating references to well-known musicals, like “The Gay B-C’s” spoofing “Do-Re-Mi” from “The Sound of Music.” A highlight is Rousouli’s dance solo inspired by the “Music and the Mirror” number from “A Chorus Line,” in which he nails a well-calibrated mix of reverence, satire and abandon. That moment, among the few harking back to the goofball spirit of “Titaníque,” only accentuates how calculated the rest of the show feels.