Trial by Jury.
Mikado
In "The Pirates of Penzance" the Major General sings about "that infernal nonsense, Pinafore," referring to "H.M.S. Pinafore."
In some types of opera and operetta, there is spoken dialog between musical numbers to advance the plot. But in "Grand Opera", traditionally every word of what would normally be dialog is sung.
The Savoy operas were the original name for the operas of Sir Arthur Sullivan and W.S. Gilbert, aka Gilbert and Sullivan.
patience
Gilbert & Sullivan
It was about a ship named "HMS Pinafore" in the navy.
Patience.
The Yeomen of the Guard.
In general, opera is entirely sung, while operettas and musicals include spoken dialog.
The pirates of Penzance. Very ribald and funny opera. Made fun of the British way of conducting the navy.
The Major-General's Song is a patter song from Gilbert and Sullivan's 1879 comic opera The Pirates of Penzance.