How many operas did the person who wrote the music for Haddon Hall make?
Haddon Hall (opera): Haddon Hall is an English light opera with music by Arthur Sullivan and a libretto by Sydney Grundy. Arthur Sullivan:  His works include 23 operas, 13 major orchestral works, eight choral works and oratorios, two ballets, incidental music to several plays, and numerous hymns and other church pieces, songs, and piano and chamber pieces.
23