Question: Who appeared in the London debut of a musical with music and lyrics by Stephen Sondheim?
Sentence (from "Finishing the Hat"): Finishing the Hat: Collected Lyrics (1954–1981) with Attendant Comments, Principles, Heresies, Grudges, Whines and Anecdotes is a book by American musical theatre composer and lyricist Stephen Sondheim.
Relevant evidence: No