text: This man played organ in concertos as interludes in his large-scale vocal works.
full_question: This man played organ in concertos as interludes in his large-scale vocal works. He was born in Halle, now part of Germany, and in the middle of his career was employed by the elector of Hanover. A British act of parliament granted this composer citizenship in the early 18th century. He wrote the first English Oratorio, "Esther", as well as several operas and Concerti Grossi. His other music includes the "Water Music" suites and "Music for the Royal Fireworks." Name this composer of the oratorio "Messiah."
first_sentence: This man played organ in concertos as interludes in his large-scale vocal works.