Question: What nationality/style of Opera did both Alessandro Scarlatti and Christoph Willibald Gluck compose?
Sentence (from "Christoph Willibald Gluck"): Born in the Upper Palatinate (now part of Germany) and raised in Bohemia, he gained prominence at the Habsburg court at Vienna, where he brought about the practical reform of opera's dramaturgical practices that many intellectuals had been campaigning for over the years.
Relevant evidence: No