Question: Which stories is the musical, in which Stephen Flaherty was nominated eight Tony Awards for, based on?
Sentence (from "Stephen Flaherty"): They are best known for writing the Broadway musicals "Once on This Island", which was nominated for eight Tony Awards, "Seussical", which was nominated for the Grammy Award, and "Ragtime", which was nominated for twelve Tony Awards and won Best Original Score.
Relevant evidence: Yes